New York (CNN) -- Thousands of Occupy Wall Street demonstrators deluged New York on Thursday, a show of strength in the movement's original home that was echoed nationwide as part of a "mass day of action."





Scores were arrested in New York, and several police officers were reported injured, as protesters fanned out across the city moved toward Foley Square in Lower Manhattan and the Brooklyn Bridge.





By early Thursday evening, many had crossed the bridge -- the same place where more than 700 had been arrested last month -- chanting, "This is what democracy looks like -- This is what America looks like," according to the New York movement's official Twitter feed. This time, they marched in the pedestrian walkway, not blocking the roadway. Nearby, pro-Occupy slogans were projected onto one side of the Verizon Building.





Those in New York were not alone. Like-minded activists also took to the streets in all corners of the nation -- from Miami to Los Angeles to Portland, Oregon, to Boston -- marking two months since the activist effort aimed at the nation's wealthiest 1% began in Manhattan.





Roundup of protests across the country





"I think the numbers have increased dramatically today," said New York protester Jo Robin. "Particularly after the raid, our message is being broadcast all over the world."





The group twice squared off against riot police in Zuccotti Park, where they'd been evicted two days earlier. They'd also engaged in several confrontations with police, leading to scores of arrests.





That includes 64 protesters -- wearing T-shirts with the figure "99%" prominently featured -- arrested at an early evening sit-in on Centre Street near Foley Square in lower Manhattan, a police spokesman said. (Earlier, police spokesmen and protest organizers had said -- incorrectly -- that 99 people were arrested in this same incident.)





In total, police said around 8 p.m. that a total of 245 people had been arrested around the city.





During a late afternoon press conference, Police Commissioner Ray Kelly said that at least seven police officers were hurt Thursday during exchanges with protesters.





Five of those officers were injured when a unidentified liquid was thrown on their faces, Kelly said, adding that the officers experienced a burning sensation and required hospitalization.





And a 24-year-old police officer was injured when a star-shaped glass object was thrown at him, Mayor Michael Bloomberg told reporters during a visit to Bellevue Hospital Center where the officer was being treated.





It is not clear how many demonstrators have been injured during the clashes.





Overheard on CNN.com: Some tire of Occupy protesters





CNN and CNN affiliate New York One broadcast images of the exchanges, including video of one man -- whose face appeared to be covered in blood -- sitting near police who wielded shields and batons.





Authorities constructed barricades at Zuccotti Park, in front of the New York Stock Exchange and along Fifth Avenue in an apparent attempt to keep demonstrators off the roads and on pedestrian walkways.





Residents and workers near the New York Stock Exchange were required to flash identification cards as police cordoned off the area amid concerns that demonstrators would try to disrupt trading.





Earlier in the day, protesters lifted metal barricades that ringed Zuccotti Park, a former home-base for the movement, defying authorities and blocking traffic.





Bloomberg said the day's protests had "caused minimal disruptions to our city," he asserted that some demonstrators had "deliberately pursued violence."





In Lower Manhattan, CNN iReporter Alvaro Perez shot video showing protesters being pulled away by police, including one woman who appeared to be dragged by her jacket and backpack.





"I don't want to speculate on what happened in advance of that," police spokesman Paul Browne said of the incident.





He said the "big picture" of how police have handled demonstrations has so far been mostly positive.





"People were able to get to work" and "protesters were able to protest," Browne added.





Occupy roundup: Movement marks 2 months





Earlier, on CNN's "American Morning,"
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