PITTSBURGH — A state trooper has sued the Pittsburgh police, saying they arrested him on false charges and used excessive force to arrest him when he tried to calm down a rowdy groomsman following a brawl after his brother’s wedding.

Trooper David Williams, 35, of Plum claims city officers falsely claimed he attacked and confronted them when, in fact, they pushed and punched him for no reason, escalating a situation he was trying to help them control.

Williams’ attorney, Timothy O’Brien, says the case is important because if a fellow officer can be abused “who amongst us is not in danger of having it happen to them.”