People hold pens in Marseille, southern France, on Jan. 7,...

People hold pens in Marseille, southern France, on Jan. 7, 2015, as they take part in a gathering following an attack by unknown gunmen on the offices in Paris of satirical weekly Charlie Hebdo. Credit: Getty Images / Boris Horvat

Cartoonists and journalists throughout the world are mourning after shooters stormed the offices of Charlie Hebdo, a weekly satirical magazine in Paris, killing 12 people, including four cartoonists.

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