Several heavily-armed terrorists ruthlessly gunned down a dozen people, including two police officers, at the Paris offices of satirical magazine Charlie Hebdo on Wednesday. Ten journalists, which included a cartoonist and the publication's editor, were among those murdered. Video captured the moment a police officer was viciously gunned down on the sidewalk, and then shot at close range, by one of the masked killers. President François Hollande called the shooting "a terrorist attack without a doubt." He also said via Twitter, "No barbaric act will never extinguish the freedom of the press. We are a united country." Charlie Hebdo is a magazine famous for making fun of the Muslim Prophet Mohammed and Islamic leaders. While police have not determined a motive, the magazine tweeted a cartoon about ISIS's top terrorist just minutes before the shooting rampage. The office was once bombed in 2011 after joking about Islam's prophet.