Paris Attack Sparks #JeSuisCharlie Hashtag

The attack on satirical French magazine Charlie Hebdo has sparked outrage and mourning on social media, with supporters of the decades-old magazine tweeting under the hashtag #JeSuisCharlie, which translates to "I am Charlie."

The magazine has long been the subject of threats and even attacks for poking fun at political and religious icons, including the prophet Mohammed.

After gunmen killed 12 people today at the magazine offices in a reported terrorist attack, supporters started to tweet out their backing for the magazine and for freedom of speech under the new hashtag.

Read More About the Charlie Hebdo Attack Here

Those that tweeted included reporters and media figures, but also readers passionate about the publication.

The magazine has a weekly print circulation of about 30,000. Its name refers to Charlie Brown from "Peanuts" and the French word for weekly newspaper, hebdomadaire.

A dark day for freedom of expression, an appalling human tragedy. #JeSuisCharlie #CharlieHebdo pic.twitter.com/IaTCXg8iD4

- amnestypress (@amnestypress) January 7, 2015You can kill journalists, cartoonists. You can't kill the freedom of the press. You have only made their message stronger. #JeSuisCharlie

- Emily Koch (@EmilyKoch22) January 7, 2015Une rose sur la place de la Rpublique #JeSuisCharlie pic.twitter.com/URQTQucLM4

- T Quinault Maupoil (@TristanQM) January 7, 2015