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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 heading toward Foley Square in lower Manhattan and the Brooklyn Bridge. By early Thursday evening, people were crossing 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 look like," according to the New York movement's official Twitter feed. This time, they marched in the pedestrian walkway, not blocking the roadway.

But 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 -- marking two months since the activist effort aimed at the nation's wealthiest 1% began in Lower Manhattan.

"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 99 Occupy Wall Street protesters taken into custody early Thursday evening, according to a high-ranking member of the city police department -- hours after protest organizers said 99 people were prepared to sit down in a street and be arrested. This figure is symbolic, since activists purport to represent the interests of 99% of the population, as opposed to the wealthiest 1%.

This figure is an addition to at least 177 people who Police Commissioner Ray Kelly said had been arrested during a late afternoon press conference. He also noted then that seven police officers were hurt 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.

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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.

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Earlier, on CNN's "American Morning," Howard Wolfson, a New York City deputy mayor, vowed, "We'll make sure, if people want to peacefully protest, they have the right to." But, he added, "if people break the law, we'll have to deal with that."

"If they attempt to enter a building they're not allowed in, that's breaking the law. If they want to express their concerns about Wall Street, that's totally fine," he said.

While the city has come under fire from protesters and other critics for arrests and removing protesters from Zuccotti Park, Wolfson insisted that "we had to act" to stop illegal activity, such as drug use, and to eliminate fire hazards.

"This is a place where we honor the First Amendment," he added.

Still, the ouster from Zuccotti Park did not appear to stifle the New York protest effort. The group tried to sum up its intent on a Twitter post: "Enough of this economy that exploits and divides us. It's time we put an end to Wall Street's reign of terror and begin building an economy that works for all."

The Occupy movement, likewise, showed few signs of abating elsewhere in the United States.

In cities such as St. Louis, Milwaukee and elsewhere, thousands responded to the "day of action" plea.

And as in New York, some of those ended up behind bars after refusing to heed law enforcement officers' calls to move. That included 25 in Portland, according to police Lt. Robert King; eight in Atlanta, according to a police statement; and several more in Los Angeles and Houston, according to witnesses and video footage.

And in Denver, District Attorney Mitchell Morrissey announced Thursday that three men now face felony charges -- including inciting a riot and assaulting a police officer -- for their alleged actions while clashing with authorities during Occupy Denver protests.

CNN's Josh Levs, Mary Snow, Brian Vitagliano, Steve Kastenbaum, Eden Pontz and Rob Frehse contributed to this report.