ATHENS, Greece — Greek riot police used tear gas and stun grenades Tuesday in Athens to disperse about 3,000 left-wing marchers protesting a visit by President Barack Obama after they tried to enter an area off-limits to demonstrators.
Police made at least four arrests and said one woman was slightly injured in the clashes, which took place far from Obama’s meetings.
The violence broke out as youths in motorcycle helmets and gas masks, armed with wooden clubs and petrol bombs, tried to break a police cordon in front of a barrier formed by police buses.
