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Demonstrators aim a laser beam towards a riot police officer during a protest against the visit of US President Barack Obama in Athens, Tuesday, Nov. 15, 2016. Greek riot police used tear gas and stun grenades in central Athens Tuesday to disperse about 3,000 left-wing marchers protesting a visit by President Barack Obama, after they tried to enter an area declared off-limits to demonstrators. (AP Photo/Yorgos Karahalis)