NEW YORK -- Occupy Wall Street protesters clogged streets and tied up traffic around the United States on Thursday to mark two months since the movement's birth and to signal that they aren't ready to quit, despite the breakup of many of their encampments by police.

More than 300 people were arrested, most of them in New York.

The marches were for the most part peaceful, with only scattered clashes between police and demonstrators.

Most of the arrests were for blocking streets, the traffic disruptions were brief, and the turnout, at least in New York, fell well short of what police had been expecting.

Chanting "All day, all week, shut down Wall Street," more than 1,000 demonstrators gathered near the New York Stock Exchange and sat down in several intersections.

Helmeted police broke up some of the gatherings, and operations at the stock market were not disrupted.

At least 177 people were arrested in New York alone. Some were bloodied during the arrests.

In Los Angeles, about 500 sympathizers, many of them union members, marched downtown between the Bank of America tower and Wells Fargo Plaza, chanting, "Banks got bailed out, we got sold out." More than two dozen people were arrested.