The video shows two uniformed police officers struggling with a suspect. Soon, a flood of officers, including the undercover cop in question, rush to help handcuff the suspect.

The incident took place in January at the Sillwell Avenue station in Brooklyn, but the video emerged this month after investigations by the NYPD's Internal Affairs Bureau and the Brooklyn District Attorney's office.
The officer, whose name has not been released, has been stripped of his badge and gun.