Update: A law enforcement official says no active shooter was found at the military post outside Washington.
The law enforcement official was not authorized to discuss the matter by name and spoke on condition of anonymity.
Joint Base Andrews tweeted Thursday that firsts responders are on the scene to secure the base that is on lockdown due to a report of an active shooter and that first responders are now on scene to secure the base.
The base instructed all personnel at the base in Washington’s Maryland suburbs to continue to shelter in place and stay inside.
A second tweet from the base said the incident was ongoing at the Malcolm Grow Medical Facility.
Joint Base Andrews is located about 20 miles outside of downtown Washington, D.C. and hosts aircraft used by President Obama.
Rodney Smith, the patient advocate at the Andrews medical facility, said an active-shooter exercise was scheduled for Thursday morning, and then he was told it was a “real-world” situation. He said he was on lockdown and didn’t have any more information.
“First it was an active-shooter exercise. Then it came back ‘real world,'” Smith said by phone Thursday morning.
Smith said the situation was unfolding at the newer of two buildings at the Malcolm Grow Medical Facility on the base. He was in the older building.