A man holds his head in his hands as he lays flowers in front of the Carillon cafe, in Paris, Saturday, Nov.14, 2015. French President Francois Hollande vowed to attack Islamic State without mercy as the jihadist group admitted responsibility Saturday for orchestrating the deadliest attacks inflicted on France since World War II. (AP Photo/Thibault Camus)

France vows ‘merciless’ war on IS for Paris attacks that kill 127

French President Francois Hollande called the carnage “an act of war that was prepared, organized, planned from abroad with internal help.”