At least five people have been killed and around 50 more injured when an Amtrak passenger train derailed in Philadelphia.
Up to seven carriages of the Washington to New York service are said to have left the tracks – one was described as having been bent into an L-shape by a witness.
Dozens of emergency personnel used flashlights to comb the area for survivors after dark. They used ladders to climb over the flipped trains.
Multiple fire engines, ambulances and police cars were deployed on the scene.
About 240 people were on board the train which operates without seat belts.
So far the cause of the accident is unknown.
Amtrak is a national publicly funded rail service, serving tens of millions of people every year.