French President Francois Hollande, left, followed by Prime Minister Manuel Valls, march during a ceremony to pay tribute to the three police officers killed in the attacks, in Paris, France, Tuesday, Jan. 13, 2015. Police officers Ahmed Merabet, 40, Franck Brinsolaro, 49, were killed during the attacks at Charlie Hebdo, and Clarissa Jean-Philippe killed in Montrouge last week. (AP Photo/Francois Mori, pool)
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