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Police surrounded a supermarket in southern France on Friday as a deadly hostage-taking situation played out after the shooting of a police officer.
Attacks Tuesday on the Brussels airport and its subway system have led authorities in Europe and elsewhere to tighten security at airports, on subways, at the borders and on city streets
The Islamic State of Iraq and Syria (ISIS) claimed responsibility for the attacks, saying its extremists opened fire in the airport and "several of them" detonated suicide belts.