Buoyed by the longevity of the Occupy Wall Street encampment in Manhattan, a wave of protests swept across Asia, the Americas and Europe over the weekend, with hundreds and in some cases thousands of people expressing discontent with the economic tides in marches, rallies and occasional clashes with the police.

In Rome on Saturday, a rally thick with tension spread over several miles. Small groups of restive young people turned a largely peaceful protest into a riot, setting fire to at least one building and a police van and clashing with police officers, who responded with water cannons and tear gas. The police estimated that dozens of protesters had been injured, along with 26 law enforcement officials; 12 people were arrested.

By early Sunday in New York, 92 people had been arrested, including 24 accused of trespassing in a Greenwich Village branch of Citibank and 45 during a raucous rally of thousands of people in and around Times Square. More than 1,000 people filled Washington Square Park on Saturday night, but almost all of them left after dozens of police officers with batons and helmets streamed through the arch and warned that they would be enforcing a midnight curfew. Fourteen were arrested for remaining in the park.

Three police officers were injured dealing with a rambunctious crowd at 46th Street and 7th Avenue; they were treated at Bellevue Hospital Center and released.