French President Francois Hollande, left, and Paris mayor Anne Hidalgo walk to pay homage to late police officer Ahmed Merabet in Paris, Tuesday Jan. 5, 2016. Hollande is honoring 17 victims killed in Islamic extremist attacks on satirical newspaper Charlie Hebdo, a kosher market and police a year ago this week, unveiling plaques around Paris marking violence that ushered in a tumultuous year. (Benoit Tessier, Pool Photo via AP)
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