French authorities continue to hunt for two brothers named in the attack on a satirical magazine in Paris yesterday. They’ve been identified as Cherif and Said Kouachi.

A third suspect has turned himself in.

Twelve people were killed when three gunman assaulted the offices of Charlie Hebdo. The magazine has angered Muslims for its satirical depiction of the Prophet Mohammad.

Among the dead are eight journalists and cartoonists, two police officers, a maintenance worker and a visitor.

France has declared a national day of mourning today and raised its terror alert system to its maximum level.

Meanwhile, another police officer and a street-sweeper were killed in a separate attack this morning. It’s unclear whether it is related to yesterday’s assault.

Charlie Hebdo had been involved in a long-running and provocative battle with Islamic extremists. And there is debate among Canadian media outlets about publishing potentially inflammatory material.

Frank Magazine says it will publish all the cartoons of the Prophet Muhammad that many Muslims consider blasphemous as a show of solidarity with Charlie Hebdo. The National Post is also running the images online.

But the head of journalistic standards at CBC says the cartoons are offensive to Muslims as a group.

Marc-Francois Bernier teaches journalism ethics at the University of Ottawa. He says freedom of expression is not the same as an obligation to publish; rather it’s about the freedom to make responsible choices.