A man holds up a pen as he and others gather to pay tribute to victims of the terrorist attack against the French satirical weekly Charlie Hebdo, Friday, Jan. 9, 2015, at JFK Plaza, commonly known as Love Park, in Philadelphia. On Wednesday, masked gunmen stormed the Paris offices of?the weekly newspaper that caricatured the Prophet Muhammad, killing at least 12 people, including the editor. (AP Photo/Matt Rourke), APTOPIX