Minneapolis police officials say two lieutenants are the subject of an internal investigation following allegations that they used excessive force against a man they arrested late last month. Community activists say they've talked to witnesses who say the alleged victim was handcuffed and struck by the officers and placed in the back seat of a squad car with the windows rolled up on a hot day. Interim police chief Tim Dolan didn't comment directly on the allegations but says the investigation will be handled in a timely and professional manner. Dolan appeared this morning at a press conference held at the Little Earth United Tribes housing complex -- the site of the alleged incident. He was confronted by some community members who charged that one of the officers under investigation was known for bad behavior.