About 25 people were arrested Saturday as hundreds gathered in New York City to mark the coming one-year anniversary of the start of the Occupy Wall Street movement, a representative for an organization defending the protesters said.

The activities started Saturday in Manhattan's Washington Square Park and culminated with an evening march to the Financial District.

Many of the arrests occurred during that march, though some were arrested at Trinity Church in Lower Manhattan near the protest movement's nexus at Zuccotti Park, said Susan Howard, chapter coordinator for the National Lawyers Guild. One person was arrested in Washington Square Park, she said.

It wasn't immediately clear what charges the protesters faced. A spokesman for the New York Police Department couldn't immediately confirm the arrests. Many of those arrested were in the process of being released late Saturday night, Ms. Howard said.

Protesters had gathered Saturday to try to reignite passions in advance of Monday's anniversary.