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... The brief confrontation came at the end of a peaceful march by thousands against the environmental impact of the Games and the presence of U.S. agents in Italy.

Police held off the violent demonstrators, who appeared to be trying to reach the Santagiulia Olympic ice hockey rink, after the skirmish. By then, the larger peaceful protest, including families with small children and students, had dispersed.

Earlier, a group of masked protesters had set off smoke bombs and firecrackers on a bridge overlooking a construction site about 800 meters (a half-mile) from the Olympic Village that's housing around 1,500 athletes. ...