美警方在北约峰会会场外逮捕抗议者

Police in Chicago have arrested at least 45 protesters after clashes with authorities outside the NATO summit.

Thousands of anti-war protesters took part in the largely peaceful demonstrations Sunday. But late in the afternoon, some of the protesters tried to push through a line of police keeping them from the lakeside convention center where leaders and delegates from 50 countries are meeting.

Police in riot gear used batons to respond to the demonstrators after several protesters threw bottles and other objects at the officers. Police officials said four officers suffered minor injuries in the clashes.

Earlier Sunday, police said two men were in custody on charges of planning to make bombs for use during the NATO meetings.