US Amtrak train derails: 'I heard a big bang'

A passenger train has derailed in Philadelphia, killing at least five people and injuring dozens of others, officials in the US city say.

Up to 10 carriages of the Washington-New York Amtrak service reportedly went off the track on Tuesday evening.

Emergency officials and fire-fighters are at the scene looking for passengers who may be trapped in the wreckage.

Edwin was not on the train but heard the derailment and saw a number of injured people. He spoke about what he saw.

Interview footage courtesy of ABC