BRIDGEPORT - Firefighters are investigating a blaze at a Bridgeport apartment complex.Authorities say the fire broke out at around 1 a.m. on the ninth floor of the Regency House building on North Avenue.Firefighters say the blaze was contained to one apartment and that the fire was quickly extinguished. Two apartments were damaged by smoke and water.Officials say the person living in the apartment where the fire started was taken to the hospital with injuries.