Philadelphia, May 13 (RHC)-- A U.S. passenger train with more than 200 passengers on board has derailed in Philadelphia, Pennsylvania, killing several people and injuring more than 50 others. Philadelphia Mayor Michael Nutter confirmed at a news conference that at least six people were killed in the accident on Tuesday night.

Fire officials said more than 50 people on board the train were taken to area hospitals, six of them critically injured. Authorities said they had no idea what caused the train wreck.

The Amtrak railroad company said there were 238 passengers and five crew members aboard its derailed No. 188 train on route from Washington, DC to New York. It said Amtrak service along the whole Northeast train corridor between New York and Philadelphia had been suspended.