A 22-year-old male driver was seriously hurt when his car smashed into a tree at 2:33 a.m. There were at least two other men in the car with the driver, Cameron J. Sylvester of 49 Village Street. He was taken to Mass General. He was semi-conscious and unresponsive at the scene prior to evacuation. The two passengers were treated and released. There is a possibility that a fourth person was in the car and fled the scene. Police were still investigating that possibility.