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 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.

More than 240 people were on board the Washington-New York train

More than 240 people were on board Train 188, the officials say. It is not known what caused the derailment.

The National Transportation Safety Board said it was dispatching a team of investigators to the crash site.

(Source: BBC)