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The United States has issued a global travel warning after the terror attack in France, and earlier attacks in Australia and Canada.
The alert comes hours after French police killed three hostage-takers in a pair of incidents.
Two of the men are believed responsible for Wednesday's attack on the office of a newspaper in Paris in which 12 people were killed.
It was France's deadliest terror incident in decades.
The warning also cited last month's hostage standoff at a Sydney cafe and the October killing of a soldier near Canada's parliament.
