PITTSBURGH — A Pittsburgh police officer today was put on desk duty after video surfaced showing him punching a Harmony woman at the city’s gay pride parade and festival.

The officer, Souroth Chatterji, will remain on restricted duty for a month during an internal investigation, Mayor Bill Peduto said today.

Chatterji said in a criminal complaint that he was trying to break up a fight when he grabbed Ariel Lawther, 22, by the head and punched her in the side so he could handcuff her. The officer said Lawther fought with him and kicked him in the groin, resulting in charges of aggravated assault and resisting arrest.

She also was charged with simple assault for allegedly attacking a man the mayor said was with a group of people opposing the parade.