Hundreds of Occupy Wall Street protesters arrested
They were part of a larger group crossing the bridge from Manhattan, where they have been camped out near Wall Street for two weeks.
Some entered the bridge's roadway and were met by a large police presence and detained, most for disorderly conduct.
The loosely-organised group is protesting against corporate greed.
They say they are defending 99% of the US population against the wealthiest 1%.
Occupy Wall Street called for 20,000 people to "flood into lower Manhattan" on 17 September and remain there for "a few months".
Several hundred remain camped at Zuccotti Park, a privately owned area of land not far from Wall Street.
A police spokesman quoted by Reuters said the arrests came "after multiple warnings by police were given to protesters to stay on the pedestrian walkway".
"Some complied and took the walkway without being arrested. Others locked arms and proceeded on the Brooklyn-bound vehicular roadway. The latter were arrested," the spokesman said.
Many were released again shortly afterwards, police said.
Some of the protesters said police had allowed them on to the roadway and were escorting them across when they were surrounded and the arrests began.Continued..