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A demonstrator holds a cardboard depicting one of Charlie Hebdo magazine's covers during a Unity rally Marche Republicaine in Paris on January 11, 2015 in tribute to the 17 victims of a three-day killing spree by homegrown Islamists. The killings began on January 7 with an assault on the Charlie Hebdo satirical magazine in Paris that saw two brothers massacre 12 people including some of the country's best-known cartoonists, the killing of a policewoman and the storming of a Jewish supermarket on the eastern fringes of the capital which killed 4 local residents. AFP PHOTO / PATRICK KOVARIK (Photo credit should read PATRICK KOVARIK/AFP via Getty Images)