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Amtrak train derails in Philadelphia, causing multiple injuries
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.
MSNBC reported about 240 passengers were aboard the train, citing Amtrak officials.
(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)