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Thibault Camus, Associated Press
Police officers and firemen gather outside the French satirical newspaper Charlie Hebdo's office, in Paris, Wednesday, Jan. 7, 2015. 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.

PARIS — Masked gunmen have stormed the Paris offices of a satirical newspaper, killing 11 people before escaping, in France's deadliest terror attack in at least two decades.

French President Francois Hollande says the attack on the Charlie Hebdo weekly, which has frequently drawn condemnation from Muslims, is "a terrorist attack, without a doubt," and says several other attacks have been thwarted "in recent weeks."

France has raised its alert to the highest level, and reinforced security at houses of worship, stores, media offices and transportation.