article_snippet: gunman Amedy Coulibaly attack followed one on the office of the French satirical magazine Charlie Hebdo.
article_snippet: France has been under a heightened state of alert since January's terror attacks in Paris that killed 17 people.
article_snippet: Brothers Cherif and Said Kouachi, authors of the deadly attack on the Charlie Hebdo offices, were killed days later after two violent standoffs.
article_snippet: Brothers Cherif and Said Kouachi, authors of the deadly attack on the Charlie Hebdo offices were accused of killing 12 people in a massacre at the Charlie Hebdo offices.
article_snippet: Charlie Hebdo has a controversial history of depicting the Prophet Mohammed, often in an unfavorable light, which has angered many Muslims around the world.
article_snippet: Earlier cartoons depicting the Prophet Mohammed spurred protests and the burning of the French satirical magazine Charlie Hebdo's office three years ago.
article_snippet: Since His attack, European nations have carried out raids on suspected terror cells with links to ISIS in Syria.