At least 10 people were injured Saturday when a subway car derailed in Boston, forcing authorities to evacuate passengers through the train's tunnel, officials said. None of the injuries were considered life-threatening. "We had a total of 10 patients. Nine were transported to area hospitals, varying in severity of injuries. Overall, all the patients that we saw today will have a positive outcome," said Steve McHugh, of Boston EMS. "We are going to conduct a full investigation into this derailment," said Steve Poftak, general manager of the Massachusetts Bay Transportation Authority. The derailment happened around 11 a.m. Saturday. Severe delays have been reported following the derailment, according to CBS Boston. Officials asked residents to find alternate transportation. There were 150 people on the train when it derailed and 500 riders on the train behind it.