French President Francois Hollande (C) arrives after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, January 7, 2015. Eleven people were killed and 10 injured in shooting at the Paris offices of the satirical weekly Charlie Hebdo, already the target of a firebombing in 2011 after publishing cartoons deriding Prophet Mohammad on its cover, police spokesman said. Five of the injured were in a critical condition, said the spokesman. Separately, the government said it was raising France's national security level to the highest notch.

French soldiers patrols at the Eiffel Tower after a shooting at a French satirical newspaper, in Paris, France, Wednesday, Jan. 7, 2015. France reinforced security at houses of worship, stores, media offices and transportation after masked gunmen stormed the offices of a French satirical newspaper Wednesday, killing at least 11 people before escaping, police and a witness said. The weekly has previously drawn condemnation from Muslims. (AP Photo/Christophe Ena)

Police investigators are seen at the scene after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, January 7, 2015.

Police inspect damage after a collision between police cars at the scene after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, January 7, 2015.

A view shows policemen and rescue members at the scene after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, January 7, 2015.

Poice officers gather at Charlie Hebdo offices after a deadly attack on the french satirical magazine on January 7, 2015 in Paris, France.

Policemen work at the scene after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, January 7, 2015.

A police officer stands in front of the headquarters of satiric French newspaper Charlie Hebdo, that "invited" the Prophet Muhammad as a guest editor this week, in Paris, Wednesday, Nov. 2, 2011. A police official said the fire broke out overnight at the offices of Charlie Hebdo, and the cause remains unclear. No injuries were reported. The official spoke on condition of anonymity because an investigation into the fire is under way. (AP Photo/Thibault Camus)