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PHILADELPHIA (AP) — Mayor Michael Nutter says at least five people were killed and another six people were critically injured when an Amtrak train derailed in Philadelphia on Tuesday night.

The train was traveling from Washington, D.C., to New York City when it derailed in the Port Richmond neighborhood. Mayor Nutter stressed at a late-night news conference that the death toll was preliminary.

He called it “an absolute disastrous mess” and said he’d never seen anything like it.”

The front of the train was going into a turn when it shook.

An Associated Press employee on the train says it appears the train went off the tracks. Paul Cheung says he was fortunate to be at the back of the train and the front of it “looks pretty bad”.

Police swarming the Port Richmond area where the crash occurred are telling people to get back.

Former Congressman Patrick Murphy was on the train and says he has been helping people. He has been tweeting photos of firefighters helping people in the wreckage.

The cause of the crash wasn’t immediately known. The National Transportation Safety Board said it was gathering information about the derailment.