State and county prosecutors say they are probing an allegation that police officers in New Jersey assaulted a man “without provocation” back in December.

According to officials, the Office of Public Integrity and Accountability in the New Jersey attorney general’s office will be investigating, along with Passaic County prosecutors.

Officials say the case concerns allegations of assault by Paterson officers on a then 19-year-old man early on Dec. 14.

The man asserted that he was attacked for no reason; the officers maintained he approached them causing a disturbance and attacked one of them.

Anyone with information is asked to call investigators.

AP wire services helped contribute to this report.