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A man holds a placard, reading: "Je suis Charlie" ("I am Charlie") as some 30,000 people take part in a unity rally (Marche Republicaine) on January 11, 2015 in the western French port of Brest in tribute to the 17 victims of the three-day killing spree that ended on January 9. 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 / FRED TANNEAU (Photo credit should read FRED TANNEAU/AFP via Getty Images)