People hold signs reading 'Coexist' during a unity rally (Marche Republicaine) on January 11, 2015 in Rennes where some 115000 people took part in tribute to the 17 victims of the three-day killing spree in Paris. 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, and the hostage-taking of a Jewish supermarket on the eastern fringes of the capital, which killed four people. AFP PHOTO / JEAN-FRANCOIS MONIER        (Photo credit should read JEAN-FRANCOIS MONIER/AFP/Getty Images)