Police and fire crews closed West 56th Street at Kessler Boulevard early Tuesday morning after a two-vehicle accident injured four teenagers. Police say a car traveling northbound on Kessler about 2:30 a.m. ran a red light and struck a sport-utility vehicle. Two of the teens are in critical condition and the other two are in stable condition. Two people inside the SUV were not injured. Fog may have been a factor in the accident.