Video from Philadelphia's Puerto Rican Day parade over the weekend shows a uniformed cop punching a woman in the face. The blow leaves the woman's mouth bloody. The officer — identified as Lt. Jonathan Josey — then handcuffs her and another cop leads her away.

Philadelphia Police Internal Affairs is investigating, according to WCAU-TV.

The clip shows a group of cops gathered on North 5th St. Sunday afternoon, apparently handcuffing a man pressed up against a car. Someone in the crowd flings water from a bottle at them, and Josey turns around in the direction it came from.