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Candles are lit as people gather in Hong Kong, Saturday, Nov. 14, 2015, to mourn for the victims killed in Friday's attacks in Paris. French President Francois Hollande said more than 120 people died Friday night in shootings at Paris cafes, suicide bombings near France's national stadium and a hostage-taking slaughter inside a concert hall.  (AP Photo/Kin Cheung)
Candles are lit as people gather in Hong Kong, Saturday, Nov. 14, 2015, to mourn for the victims killed in Friday's attacks in Paris. French President Francois Hollande said more than 120 people died Friday night in shootings at Paris cafes, suicide bombings near France's national stadium and a hostage-taking slaughter inside a concert hall.  (AP Photo/Kin Cheung)

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Managing Director at GlobalStrat Olivier Guitta gives a general sense of what authorities will be looking at when investigating the recent terror attacks in Paris.

Hollande calls ISIS attack 'an act of war'

Managing Director at GlobalStrat Olivier Guitta gives a general sense of what authorities will be looking at when investigating the recent terror attacks in Paris.