This morning in Paris, three gunmen entered the offices of the French satirical magazine Charlie Hebdo and starting firing. Among the 12 people killed in the terrorist attack were four of the magazine's cartoonists, including the editor of the paper.

Previously, in November 2011, the offices had been firebombed after publishing a caricature of the Prophet Muhammad, and the decades-old magazine was known for its provocative criticisms of Islamic extremism.

Many cartoonists around the world have offered their condolences and expressed their sadness and anger in the best way they know how.