The latest on the mass shooting at a social services facility in San Bernardino, California (all times local unless noted otherwise):

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Shooting Tracker: US averages over one mass shooting per day
As the United States grapples with another mass shooting, it brings up questions about the gun culture and the prevalence of gun violence. Let’s look at how often mass shootings occur in the United States. CCTV America’s Nathan King reports.

While mass shootings grab the headlines in the U.S., they kill a few hundred people a year. Total gun deaths in the U.S. are far higher. In 2013, total gun murders in the U.S. were more than 11,000. Gun suicides claimed the lives of over 21,000.

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Former NYC detective Thomas Ruskin on San Bernardino mass shooting

CCTV America’s Mike Walter spoke to Thomas Ruskin. He is a former detective for the New York City Police Department and is now president of CMP Protective and Investigative Group, Inc.

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What we know about the San Bernardino, California mass shooting suspects

CCTV America’s May Lee reports.

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Backgrounds and possible motives of two suspected San Bernarnino, California mass shooters

CCTV America’s Mark Niu reports.

3:50 p.m. EST
The husband-and-wife attackers had enough bullets and bombs to slaughter hundreds more, investigators said Thursday as they worked to figure out whether the rampage was terrorism, a workplace grudge, or some combination.

The couple left behind three rigged-together pipe bombs with a remote-control detonating device that apparently malfunctioned, and they had more than 1,600 unused bullets on hand when police shot and killed them in a rented SUV after an hours-long manhunt, police said.

At a family home, authorities also found 12 pipe bombs, tools for making more, and over 3,000 additional rounds of ammunition, Police Chief Jarrod Burguan said in a grim morning-after inventory that suggested Wednesday’s bloodbath could have been far worse.

“We don’t know if this was workplace rage or something larger or both,” Attorney General Loretta Lynch said in Washington, echoing President Barack Obama. “At this point in time we don’t know the motivation.”

Four hours after the bloodbath and two miles away, the couple died in a furious gunbattle with authorities. They fired 76 rounds, while 23 law officers unleashed about 380, the police chief said.

1:10 p.m. EST
“The amount of pre-planning, amount of ammunition, there was obviously a mission behind it,” David Bowdich, LA FBI Assistant Director, said at a press conference.

Police said the attackers had more than 1,600 bullets with them when they were gunned down.

The male suspect, 28-year-old Syed Rizwan Farook, was a U.S. citizen. He had travelled to Saudi Arabia earlier this year and returned with his new wife, 27-year-old Tashfeen Malik, the second suspect. Colleagues called him a devout Muslim, but said he didn’t speak about his religion at work.

“It would be irresponsible and premature to call this terrorism,” Bowdich said.

12:30 p.m. EST
During a press conference, San Bernardino Police Chief Jared Burguan said 21 people had been wounded in the shooting spree. This is an increase from the 14 who were originally reported as wounded.

Burguan said about 300 officers responded, across local, county, and federal agencies. The suspected shooters were wearing tactical gear, but he said they were not wearing bulletproof vests.

The pair fired 65-75 rounds from rifles at the scene, according to the police chief, spraying the room with bullets. He said this meant no particular person was specifically targeted.

Pipe bombs attached to remote controlled car were found.

11:31 a.m. EST
President Barack Obama announces that all U.S. flags should be flown at half-staff through Dec. 7 “as a mark of respect for the victims of gun violence.”

11:21 a.m. EST

President Barack Obama said it’s possible the mass shooting in California was related to terrorism but that authorities still don’t know. He said it was also possible that the attack was workplace-related or that there were mixed motives.

“Many Americans feel there’s nothing they can do about mass violence,” Obama said. But “we all have a part to play.”

The president said the nation must make it harder to carry out violence but acknowledged that the threat can’t be eliminated completely.

“As the investigation moves forward, it’s going to be important for all of us, including our legislators, to see what we can do,” he said.

5:17 a.m.

Three explosive devices — all connected to one another — were found at the social services center, police said. Federal authorities said the two assault rifles and two handguns used in the violence had been bought legally, but they did not say how and when they got into the attackers’ hands.

11:44 p.m.

The Southern California county where a pair of shooters killed 14 people and wounded 17 others will close most of its offices the rest of the week.

James Ramos, chairman of the San Bernardino County Board of Supervisors, said Wednesday that only the most essential services will remain open Thursday and Friday.

Police say the assault was launched by a heavily armed county worker and his wife and targeted his co-workers from the Department of Public Health who were holding a celebration.

The carnage happened at the Inland Regional Center, which helps people with disabilities find work, get treatment, housing and transportation.

Ramos says supervisors will try to help everyone affected by tragedy.

10:55 p.m.

The suspect in the Southern California shooting that left 14 dead traveled to Saudi Arabia earlier this year and returned with a wife.

Co-worker Patrick Baccari says Syed Farook was gone for about a month in the spring. When he came back word got around Farook had been married, and the woman he described as a pharmacist joined him shortly afterward. The couple had a baby later this year.

Baccari says the reserved Farook showed no signs of unusual behavior, although he grew out his beard several months ago.

Baccari said he been sitting at the same table as Farook at an office party Wednesday morning, but his co-worker suddenly disappeared, leaving his coat on his chair.

Baccari said he had stepped into the bathroom when the shooting started and suffered minor wounds from shrapnel slicing through the wall.

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10:45 p.m.

A relative says photos widely circulating on the Internet are not of the suspect in the mass shooting in Southern California.

Farhan Khan says he is suspect Syed Rizwan Farook’s brother-in-law. Khan says photos from Facebook are of Farook’s brother who was at work at the time of the shooting.

Khan, who is married to Farook’s sister, spoke to reporters at the Anaheim, California, office of the Council on American-Islamic Relations.

Khan says he last spoke to Farook about a week ago. He added that he had “absolutely no idea why he would do this. I am shocked myself.”

10:10 p.m.

Police say they believe the man and woman killed in a gun battle with police after Wednesday’s mass shooting were the only two shooters.

San Bernardino Police Chief Jarrod Burguan identified the woman killed in the gun battle as 27-year-old Tashfeen Malik.

The other suspect was previously identified as 28-year-old Syed Farook. Relatives have said the two were married.

Farook was an environmental specialist with the county health department who sometimes worked at the Inland Regional Center in San Bernardino.

Burguan told reporters that Farook angrily left an office holiday party earlier Wednesday before returning with Malik.

Hussam Ayloush, executive director of the Council on American-Islamic Relations, says the couple left their baby with family Wednesday morning and never returned.

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8:55 p.m.

The brother-in-law of one of the suspects says he was stunned to hear of his relative’s involvement in Wednesday’s shooting.

Farhan Khan, who is married to the sister of Syed Farook, spoke to reporters at the Anaheim office of the Council on American-Islamic Relations.

Khan says he last spoke to Farook about a week ago. He added that he had “absolutely no idea why he would do this. I am shocked myself.”

Khan says other family members asked him to speak at the news conference, and to express their sadness over the shootings.

7:40 p.m.

A law enforcement official has identified Syed Farook as one of the suspects in a mass shooting in Southern California.

The official, who was briefed on the case, was not authorized to speak to the media about the ongoing investigation and spoke on condition of anonymity.

Police say two suspects — a man and a woman — were killed in a gunbattle with police after the shooting at the Inland Regional Center in San Bernardino.

Police say another person who was spotted running near the gunbattle was detained but they have said it is unclear if that person had anything to do with the shooting.

The official did not provide more details.

— From AP reporter Tami Abdollah in Washington, D.C.

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6:50 p.m.

Meredith Davis, a spokeswoman with ATF, told KCAL9-TV the two suspects who died in a shootout with police after the mass killing in California were each armed with a long gun and a handgun.

They were wearing tactical-style clothing that was “loaded with magazines for a gunfight,” she said Wednesday.

Davis said the suspects also threw a thick-gauge copper pipe out of the SUV, but no explosives were found inside.

The fake pipe bomb was equipped with a piece of material made to look like a wick.

Authorities are tracing the serial numbers on the guns and authorities will be dispatched to those addresses.

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6:40 p.m.

Law enforcement officers are calling for people to come to the front door of a home in Redlands, California, where tips led authorities investigating the deadly shooting at a social services center.

One of them called out: “This is the FBI.” Officers in riot gear, a bomb squad unit and armored vehicles are outside Wednesday night. They appear to have brought in robot devices.

It’s unclear if anyone is inside the home.

San Bernardino Police Chief Jarrod Burguan has said an SUV was seen leaving the residence earlier, leading to a police pursuit and a gunbattle that killed two suspects in the shooting that left 14 people dead in neighboring San Bernardino.

6:15 p.m.

The FBI is looking at several possibilities for what drove shooters to kill 14 people at a California social services center.

David Bowdich, assistant director of the FBI’s field office in Los Angeles, says one possibility is workplace violence and another is “terrorism.”

He did not elaborate. Wednesday’s shooting left at least 14 dead in San Bernardino.

Police say two suspects, one male and one female, are dead after a shootout with police.

San Bernardino Police Chief Jarrod Burguan says authorities found what they believe is an explosive device at the Inland Regional Center where the mass shooting occurred.

Burguan also says one other person was detained who was seen running near a gunbattle, but it’s not clear if that person is connected to the mass shooting.

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5:50 p.m.

Police say a person was detained who was seen running near a gunbattle between officers and two suspects of a deadly shooting at a Southern California social services center.

San Bernardino Police Chief Jarrod Burguan also said at a news conference Wednesday evening that it was not clear if that person is connected to shooting that killed at least 14 people at the Inland Regional Center.

Burguan says two suspects, one male and one female, are dead.

The chief says tips led police to a residence in the neighboring city of Redlands, where an SUV was seeing leaving. Officers pursued the vehicle, and a gunbattle ensued.

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This item has been corrected to show that police didn’t stop the SUV but pursued the vehicle after they saw it leaving a residence.

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5:45 p.m.

Police say two suspects, one male and one female, are dead after the shooting at a Southern California social services center.

San Bernardino Police Chief Jarrod Burguan also said at a news conference Wednesday evening that authorities found what they believe is an explosive device at the Inland Regional Center in San Bernardino. Bomb squads were working on it.

The FBI says it’s a possibility that the shooting is “terrorism.”

Burguan says the suspects were wearing “assault-style clothing” and were both armed with assault rifles and handguns.

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5:35 p.m.

A witness says he saw a black SUV pull slowly away from a Southern California social services center where gunmen opened fire as people ran frantically from the building.

Glenn Willwerth says he locked up his paper business across the street and went outside with a gun. He heard 10 to 15 shots and saw an SUV with blacked-out windows drive away.

Authorities say at least 14 people were killed and more than a dozen others injured at the Inland Regional Center in San Bernardino.

Willwerth described seeing people carry one injured woman out. He also saw a pair of empty boots on a sidewalk, followed by a trail of blood.

Police say a gunbattle between occupants of an SUV and police not far from the original shooting scene left one suspect shot. Another is possibly “outstanding.”

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5:05 p.m.

Police are serving a search warrant on a home in Redlands, California, in connection with the deadly shooting at a social services facility in neighboring San Bernardino.

City spokesman Carl Baker says Redlands police are assisting San Bernardino police in the search connected to the Wednesday morning shooting that killed at least 14 people and wounded more than a dozen others.

An Associated Press reporter watched as a half-dozen vehicles carrying helmeted police drove into the area. One officer carrying an assault rifle ordered reporters to clear the area, and an armored vehicle parked outside a row of homes.

The action followed a gunbattle between occupants of an SUV and San Bernardino police not far from the original shooting scene.

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4:35 p.m.

The San Bernardino County Department of Public Health has confirmed that several of its employees were inside a social services facility when gunmen opened fire.

The department says on a verified county Twitter account that it’s not releasing any more information because of the ongoing investigation and out of respect for the victims.

Authorities say the shooting killed at least 14 people and wounded more than a dozen others at the Inland Regional Center in San Bernardino.

The health department says it will be providing services to its employees and their families.

Center President and CEO Marybeth Feild said earlier Wednesday that the department was renting out a conference area at the center for a banquet when the attack took place.

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4:20 p.m.

Gov. Jerry Brown says the shooting at a social services facility in Southern California is a brutal attack.

He said in a statement that “California will spare no effort in bringing these killers to justice.” The governor was scheduled to light the Capitol Christmas tree Wednesday evening, but his office said the ceremony will be canceled.

Authorities say gunmen killed at least 14 people and wounded more than a dozen others at the Inland Regional Center in San Bernardino.

Police Sgt. Vicki Cervantes says one suspect was shot in a gunbattle with officers and there is still possibly a suspect “outstanding.”

Armored police vehicles are surrounding a dark-colored SUV with shattered windows on a residential street.

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4:15 p.m.

Police say one suspect in the deadly shooting at a social services facility in Southern California has been shot in a gunbattle with officers.

San Bernardino police Sgt. Vicki Cervantes said Wednesday that there is still possibly a suspect “outstanding.”

Cervantes would not elaborate, and the condition of the suspect was not known. She says an officer was hurt in the shootout and went to the hospital with injuries that were not life-threatening.

Armored police vehicles are surrounding a dark-colored SUV with shattered windows on a residential street.

Authorities say gunmen killed at least 14 people and wounded more than a dozen others at the Inland Regional Center in San Bernardino.

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3:30 p.m.

Police say shots have been fired and a suspect is down near a dark-colored SUV.

It’s unclear if the suspect is related to the deadly shooting Wednesday at a social services facility in Southern California. Police have said that the suspects may have fled in a dark SUV.

San Bernardino police Sgt. Vicki Cervantes said she knew of no officers who were injured in the shootout.

Television footage showed armored vehicles blocking the SUV on a residential street.

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3:20 p.m.

Police are pointing guns at a dark-colored SUV with shattered windows on a residential street.

Police have said that the suspects in the deadly shooting Wednesday at a social services facility in Southern California may have fled in a dark SUV.

Officers were keeping their distance, pointing their weapons at the vehicle, while more police raced to the scene.

Local media said there appeared to be a person on the ground but it was unclear who they were or what their injuries may be.

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3:10 p.m.

A board member of a Southern California social services center where gunmen killed at least 14 people says she has been trying to reach more than a dozen colleagues and workers but has only heard back from one.

Sheela Stark of the Inland Regional Center in San Bernardino says she’s watching television to find familiar faces at the scene.

She says the center has two large buildings that require a badge to get in. However, the conference room where many public events take place — including a banquet Wednesday — is usually left open when they are expecting visitors.

Marybeth Feild, the president and CEO of the center, says the shooting happened in a conference area where the San Bernardino County Department of Public Health was having a banquet.

The center employs more than 600 people.

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This item has been corrected to show that Marybeth Feild’s name was misspelled Field.

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2:55 p.m.

Authorities say 10 of the 14 people wounded in a deadly shooting at a Southern California social services center were taken to hospitals in critical condition.

Fire Chief Tom Hannemann says three people were in serious condition. Authorities say an additional 14 victims were killed in the gunfire at the Inland Regional Center in San Bernardino, 60 miles east of Los Angeles.

The chief says firefighters were on the scene within seven minutes of the 11 a.m. Wednesday call and transported all the injured by 11:30 a.m.

Authorities say they are looking for up to three shooters and a motive is not yet known.

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2:45 p.m.

President Barack Obama says there’s a pattern of mass shootings in the U.S. that has no parallel elsewhere in the world.

Obama commented on the mass shooting at a California social services center in an interview with CBS News. Authorities say at least 14 people were killed and the motives of the shooters are not yet known.

Obama says there are steps the U.S. can take to reduce the frequency of mass shootings.

Obama is calling for the country to come together to make mass shootings a rare occurrence. He says the U.S. should never think mass shootings are a normal part of life.

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2:30 p.m.

Police say the attackers who killed an estimated 14 people at a Southern California social services center came prepared with long guns.

San Bernardino Police Chief Jarrod Burguan declined to say what kind of weapons they used at the Inland Regional Center. Burguan says a motive wasn’t yet clear, but that the shooters “were on a mission” and “came in with a purpose.”

He says police are looking for up to three shooters.

The attack was concentrated in one area of the building where most victims were shot, while hundreds of other people weren’t injured.

Burguan says it’s too early to say whether the attackers targeted that area or chose it out of convenience or at random.

The president and CEO of the center says the shooting happened in a conference area where the San Bernardino County Department of Public Health was having a banquet.

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2:20 p.m.

The president and CEO of the Southern California social services center where gunmen opened fire says the shooting happened in a conference area where the San Bernardino County Department of Public Health was having a banquet.

Marybeth Feild of the Inland Regional Center was not at the facility but says she is in contact with many employees. She says they told her the shooting happened Wednesday during a banquet for the health department.

San Bernardino Police Chief Jarrod Burguan estimates at least 14 people have been killed and about 14 wounded. Burguan says police are looking for up to three shooters.

He noted that most people were killed and wounded in same area. Authorities say bomb squads checked unidentifiable items in the center, but they didn’t know if the gunmen brought those items.

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2:10 p.m.

Police say that the suspects in the deadly shooting at a social services facility in Southern California may have fled in a dark-colored SUV.

San Bernardino Police Chief Jarrod Burguan said at a news conference Wednesday that he estimates at least 14 people have been killed and about 14 wounded. He says the wounded have significant injuries that may be related to gunshots.

Burguan says they are looking for up to three shooters.

Authorities have locked down courts and increased police presence at other public facilities but didn’t know the motive of the attack.

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2 p.m.

Police estimate that at least 14 people have been killed and more than a dozen wounded in the shooting at a social services facility in Southern California.

Police Chief Jarrod Burguan said at a news conference Wednesday that the number of fatalities was a preliminary number and could change.

He says up to three shooters entered the building and opened fire at the Inland Regional Center in San Bernardino.

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1:55 p.m.

Police say no one is in custody after a shooting at a social services facility in Southern California and they are searching for suspects.

San Bernardino police Sgt. Vicki Cervantes confirmed to The Associated Press that multiple people were shot and some were killed Wednesday. She says there are reports from witnesses of between one and three shooters.

She says it is still an active situation and authorities have not located any suspects.

As far as she knows, police are still trying to clear the complex. All the roads surrounding the shooting scene are closed off, and police are warning people about the shooting.

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1:50 p.m.

At least 10 people have been taken to hospitals for treatment after the shooting at a social services facility in Southern California.

San Bernardino County announced on its Twitter account that six people were being treated at Arrowhead Regional Medical Center, which is run by the county.

A spokeswoman for Loma Linda University Medical Center says four patients were taken to its trauma center.

Spokeswoman Briana Pastorino says she didn’t know their conditions. She says the hospital expects to get three more patients.

Authorities say multiple people were shot and some were killed Wednesday at the Inland Regional Center in San Bernardino.

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1:30 p.m.

Marcos Aguilera says his wife was inside a social services facility in Southern California when gunfire erupted but she got out of the building unharmed.

He told KABC-TV that a shooter entered the building next to his wife’s office and opened fire.

Aguilera says they locked themselves in her office and saw bodies on the floor. He says his wife saw ambulances taking people out of the building on stretchers.

Authorities say multiple people were shot and some were killed Wednesday at the Inland Regional Center in San Bernardino.

Police Sgt. Vicki Cervantes told KCBS-TV that police were searching for more than one gunman. She didn’t have specific numbers on the number of dead and injured.

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1:20 p.m.

A hospital says it’s received four patients in its trauma center after a shooting at a social services facility in Southern California.

Briana Pastorino, spokeswoman for Loma Linda University Medical Center, says she didn’t know their conditions. She says the hospital expects to get three more patients.

Authorities say multiple people were shot and some were killed Wednesday at the Inland Regional Center in San Bernardino.

Police Sgt. Vicki Cervantes told KCBS-TV that police were searching for more than one gunman. She didn’t have specific numbers on the number of dead and injured.

Gov. Jerry Brown’s press office said on Twitter that the governor has been briefed and “is closely monitoring this disturbing and ongoing situation unfolding in San Bernardino.”

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1:05 p.m.

Police confirm that people have died in the shooting at a Southern California social services center.

San Bernardino police Sgt. Vicki Cervantes told KCBS-TV on Wednesday that “there are multiple casualties and there are some confirmed fatalities.” She says she doesn’t have specific numbers.

She told the television station that it appears there was more than one shooter. She believes they were wearing “military-style” attire.

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12:55 p.m.

Paul Lacroix said his son was able to escape after gunfire erupted at a Southern California social services center.

Lacroix told reporters Wednesday that his son texted him and told him alarms started going off and they got word there was shooting. He said his son was sheltered with a group of people before they managed to get out.

Authorities say multiple people were shot at the Inland Regional Center in San Bernardino. Police were searching for one or more gunmen.

Lacroix said his son and colleagues were ordered to exit with their arms up and nothing in their hands.

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12:40 p.m.

The president and CEO of the Southern California social services center where gunfire has erupted says the focus is on a building that houses at least 25 employees as well as a library and conference center.

Marybeth Feild of the Inland Regional Center says “the incident is in the conference area” that an outside group was renting Wednesday. She says she is not at the center, which serves people with developmental disabilities and does not know what outside group rented the center.

Feild says people served by the center also would have been in the building, which is in San Bernardino, about 60 miles east of Los Angeles.

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12:30 p.m.

President Barack Obama has been brought up to date on the shooting at a Southern California social services center.

The White House says he was briefed by his homeland security adviser, Lisa Monaco, and has asked to be kept informed as the situation develops.

Authorities say multiple people were shot Wednesday at the Inland Regional Center in San Bernardino. Police were searching for one or more gunmen.

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12:25 p.m.

Police say they are searching for one or more gunmen after a shooting at a social services facility in Southern California.

San Bernardino Lt. Rich Lawhead said Wednesday that multiple people were shot at the Inland Regional Center.

Several law enforcement agencies converged on the scene in San Bernardino, and triage units were being set up in the area.

Some people were seen being wheeled away on gurneys, and others filed out of a building with their hands up.

The facility serves individuals with developmental disabilities in Riverside and San Bernardino counties.

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12:15 p.m.

Terry Petit says he got a text from his daughter saying she was hiding after gunfire erupted at the social services facility in Southern California where she works.

Petit choked back tears Wednesday as he read the texts for reporters outside Inland Regional Center in San Bernardino.

He says she wrote: “People shot. In the office waiting for cops. Pray for us. I am locked in an office.”

Police searched people filing out of a building with their hands up before they reunited with loved ones.

Ambulances and law enforcement vehicles are racing through the area with sirens blaring.

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11:58 a.m.

A gas station manager near the site of a shooting in Southern California says there is a flood of police activity in the area.

Ana Fuentes, manager of a Shell station about a block from the scene, estimates that there are about 150 police officers flooding the area.

She said she hasn’t gotten any instructions to stay inside but that customers coming in told her about the shootings at Inland Regional Center. The center says on its website that it provides social services to people with developmental disabilities.

Dozens of people filed out of the scene, holding their hands in their air. Other people were seen being wheeled away on gurneys.

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11:40 a.m.

Police in San Bernardino, California, are responding to reports of an active shooter at a social services facility.

Lt. Rich Lawhead said Wednesday there are reports of multiple victims.

No arrests have been made.

Sgt. Vicky Cervantes says police are working to secure the scene in the inland region east of Los Angeles.

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This story corrects that family and police say suspect’s middle name is Rizwan, not Rizwam.

Timeline from The Associated Press.