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An elite police officer arrivesoutside the Bataclan theater  in Paris, France, Wednesday, Nov. 13, 2015. Several dozen people were killed in a series of unprecedented attacks around Paris on Friday, French President Francois Hollande said, announcing that he was closing the country's borders and declaring a state of emergency. (AP Photo/Kamil Zihnioglu)
An elite police officer arrivesoutside the Bataclan theater  in Paris, France, Wednesday, Nov. 13, 2015. Several dozen people were killed in a series of unprecedented attacks around Paris on Friday, French President Francois Hollande said, announcing that he was closing the country's borders and declaring a state of emergency. (AP Photo/Kamil Zihnioglu)

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    ISIS claims responsibility for Paris attacks

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ISIS claims responsibility for Paris attacks

French President Francois Hollande calls the Paris terror attacks "an act of war." Experts weigh in on the fight against ISIS.

ISIS claims responsibility for Paris attacks

French President Francois Hollande calls the Paris terror attacks "an act of war." Experts weigh in on the fight against ISIS.