The Occupy Wall Street protesters plan to march to the Manhattan district attorney's office to demand an investigation into what they say was an "unprovoked assault" on a protester by police last week.
Activist Felix Rivera-Pitre was seen on video being punched by an officer on Friday. It was unclear in the video what preceded the punch.
The group says it will march to the DA's office early Tuesday evening.
Rivera-Pitre's lawyer, Ronald Kuby, tells The New York Times that prosecutors told him they were continuing their investigation into the incident.
The Occupy Wall Street protesters also plan to show solidarity with unionized workers locked in a contract dispute with Sotheby's. They will join the Teamster workers and other union members in a rally Tuesday outside the auction house.