An Amtrak passenger train derailed in north Philadelphia on Tuesday night, causing multiple injuries, a city fire department supervisor said, but further official details about circumstances of the wreck were not immediately available.

The official, who did not give his name, said there were “lots of injuries” but did not elaborate before hanging up.

An NBC affiliate in the city reported at least 50 people were injured when eight to 10 cars from the train derailed, citing officials.

Live television footage of the aftermath of the accident broadcast on MSNBC showed dozens of emergency workers scrambling over and around the wreckage with flashlights in the dark.

Former Pennsylvania Congressman Patrick Murphy, who was a passenger on the train, told MSNBC in an interview that his rail car flipped over.

MSNBC reported about 240 passengers were aboard the train, citing Amtrak officials. A number of media outlets reported the train, No. 188, was headed from Washington, D.C., bound for New York.

In a video posted on social media purportedly showing the aftermath of the crash, passengers could be heard crying and others were telling victims to crawl forward.

The National Transportation Safety Board said on its Twitter account that it was “currently gathering information” regarding the derailment.

(Reporting by Daniel Kelley; Additional reporting by Curtis Skinner in San Francisco, Peter Cooney in Washington and Steve Gorman in Los Angeles; Writing by Steve Gorman; Editing by Eric Walsh and Ken Wills)

Update, 11:52 p.m. EST: Philadelphia Mayor Michael Nutter confirmed that at least five people were killed in the crash, CNN reported.

“It is an absolute, disastrous mess,” Nutter said. The mayor also confirmed reports that more than 50 passengers were hospitalized. Six of them were listed in critical condition.