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Documentary filmmaker Michael Moore, who had given a speech at a nearby university, also made an appearance at the park, milling around with protesters.

With the barricades that once blocked them from Wall Street now removed, the protesters streamed down the sidewalk and covered the steps of the Federal Hall National Memorial. There, steps from the New York Stock Exchange and standing at the feet of a statue of George Washington, they danced and chanted, “We are unstoppable!”

Police have not yet given full count of arrests.

As always, the protesters focused on a variety of concerns, but for Tom Hagan, his sights were on the giants of finance.

“Wall Street did some terrible things, especially Goldman Sachs, but all of them. Everyone from the banks to the rating agencies, they all knew they were doing wrong. … But they did it anyway. Because the money was too big,” he said.

Dressed in an outfit that might have been more appropriate for the St. Patrick’s Day parade, the 61-year-old salesman wore a green shamrock cap and carried a sign asking for saintly intervention: “St. Patrick: Drive the snakes out of Wall Street.”

Stacy Hessler held up a cardboard sign that read, “Spring is coming,” a reference, she said, both to the Arab Spring and to the warm weather that is returning to New York. She said she believes the nicer weather will bring the crowds back to Occupy protests, where numbers have dwindled in recent months since the group’s encampment was ousted from Zuccotti Park by authorities in November.

But now, “more and more people are coming out,” said the 39-year-old, who left her home in Florida in October to join the Manhattan protesters and stayed through much of the winter. “The next couple of months, things are going to start to grow, like the flowers.”

Some have questioned whether the group can regain its momentum. This month, the finance accounting group in New York reported that just about $119,000 remained in Occupy’s bank account — the equivalent of about two weeks’ worth of expenses.

But Ms.  Hessler said the group has remained strong, and she pronounced herself satisfied with what the Occupy protesters have accomplished over the last half-year.

“It’s changed the language,” she said. “It’s brought out a lot of issues that people are talking about. … And that’s the start of change.”

Workers were hosing down the park Sunday as a handful of protesters watched from outside metal police barricades.

Associated Press writers Karen Matthews and Samantha Gross contributed to this report.