Across France people observed a minute’s silence at midday to show respect for the 12 people killed in an attack on the offices of the magazine Charlie Hebdo on Wednesday. CCTV’s Kate Parkinson reported this story from Paris.

The brutal nature of the attack has shocked and stunned the world.

“[The attackers] even did a roll call of the people who were in the building before shooting them one by one. Because they wanted to be sure that they were getting the big names. So yes, this was very well planned. And, unfortunately, it was also well executed,” defense analyst Francois Heisbourg said. “It was a commando style operation-a little bit like the attacks in Bombay in India a few years ago. It’s that sort of level of professionalism.”

France has launched a national appeal for information on the whereabouts of two brothers suspected of carrying out the attack. Police say they are still at large and are “armed and dangerous.”

Meanwhile, gunshots rang out again in Paris on Thursday morning. A policewoman was killed in a shootout in the south of the city. Police sources could not immediately confirm a link to Wednesday’s killings.

France’s security threat level is at its highest and the French prime minister said he feared there could be further attacks.

Surviving members of Charlie Hebdo have vowed to publish the satirical weekly next Wednesday, despite the murder of its most senior journalists.

Europe unites in support against attack in France

Europeans have expressed unity against France’s worst terrorist attack in a generation. CCTV’s Richard Bestic reported this story from London.

In the hours following the Paris massacre, thousands of people in Belgium, Switzerland, Spain, and Italy spontaneously took to the streets united against terror.

In Germany, the French tricolor flag was lowered to half-mast. The European Parliament also held a minute’s silence in tribute to those killed.

“This barbaric attack caused the death of so many people. Beyond the enormous tragedy which strikes the families of the victims – we think about them – we must not lose sight of the fact that this attack was aimed against the noblest values of the French Republic and of Europe that are common to both: freedom of expression, democracy, a way of living together, freedom of the press,” EU President Jean-Claude Juncker said.

Hélène Constanty, former Charlie Hebdo journalist discusses Paris attack

CCTV America’s Elaine Reyes interviewed journalist Hélène Constanty, a former employee of Charlie Hebdo, about the magazine’s staff and philosophy.

Haras Rafiq of think tank Quilliam discusses homegrown terrorism

CCTV America also interviewed Haras Rafiq, the managing director of the Quilliam foundation, a counter-extremism think tank.