12 Dead In Terrorist Attack At Satirical Newspaper In Paris

France is on high alert Wednesday after a terror attack at a satirical newspaper office in Paris left 12 dead.

Video footage from Wedensday's attack shows masked gunmen fleeing the office headquarters of Parisian satirical newspaper Charlie Hebdo after they had stormed the building, shooting the newspaper's editor, a lead cartoonist, two police officers and eight more victims.

Witnesses reported hearing the gunmen shout "Allahu akbar," a phrase often uttered by terrorists before they commit an attack, as they stormed the Charlie Hedbo offices. Witnesses say the gunmen also shouted "we have avenged the Prophet Mohamed."

France's President Francois Hollande said the attack on the newspaper was "a terrorist attack without a doubt," adding that the government has successfully stopped other terrorist attacks "in recent weeks."

The satirical newspaper has previously published cartoons featuring the prophet Mohamed that some in the Muslim community have decried as offensive and blasphemous.

French authorities are now searching for three suspects responsible for Wednesday's attack. No terrorist group has taken responsibility on the recent attack that has been France's deadliest terrorist incident in decades.

Obama administration spokesperson Josh Earnest said in a statement Wednesday that the U.S. knows France is not "going to be cowed by this terrible act."

Great Britain's Prime Minister David Cameron also offered his support to France via a tweet that read: "The murders in Paris are sickening. We stand with the French people in the fight against terror and defending the freedom of the press."