TREMONT - A Bronx woman is outraged after she claims her autistic son was left unattended on his school bus for more than three hours. Christine Negron says her 6-year-old son Joshua was supposed to return at 4 p.m. from his first day of school, but didn't come back until 7:30 p.m. Her son's parent coordinator informed her that he was alone on the bus, which was at Fordham Road and Morris Avenue. A spokesperson from the Department of Education (DOE) says the bus driver became sick and couldn't complete the bus route, but adds that no student was left unattended. The bus company's lawyer backs the DOE, claiming the driver became disoriented. Negron says she plans on hiring a lawyer to possibly file a lawsuit.