WEST COLUMBIA -- Two children have been killed in a mobile home fire in South Carolina. Lexington County fire officials say they responded to the fire in West Columbia about 10:30 p.m. Monday. Officials say a female baby sitter and a man in the home were able to get outside with two other children. The baby sitter was unable to get to the other children. The names of the victims have not been released. The cause of the fire was under investigation Tuesday. It was unclear if there was a working smoke director in the home.