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A commuter train derailed around 7:30 am Sunday morning in the Bronx, killing four people and injuring at least 60 others. The investigation into the cause of the accident is underway at this hour.

NBC New York reports that the eight-car train departed Poughkeepsie around 5:54 am, and was scheduled to arrive at New York's Grand Central Station at 7:43 am. The derailment occured at 7:22 am, just feet from the water near the Sputyen Duyvil station in the Bronx. Seven of the train's cars were off the track, according to published reports. None of the cars wound up in the water, despite initial contrary reports, according to NBC New York.

More than 130 firefighters are on the scene, and helicopter shots in the area show several bodies covered with white sheets. New York's Governor, Andrew Cuomo, tells reporters that authorities believe all passengers have been accounted for, but officials do not yet know what caused the accident.

Joel Zaritsky, who was on his way to New York City for a dental convention, tells the Associated Press that he woke up when his car started rolling several times. "Then I saw the gravel coming at me, and I heard people screaming. There was smoke everywhere and debris. People were thrown to the other side of the train,” he said.

Metropolitan Transportation Authority spokeswoman Marjorie Anders tells NBC News that the  big curve where the derailment occurred is in a slow speed area approaching the station. The train operator told officials that he applied the brakes, but the train did not seem to slow down, according to CNN's sources.

Sunday, of course, is one of the busiest travel days of the year as millions of Americans are headed home after the long, Thanksgiving holiday weekend. Amtrak has suspended their Empire Line Service between New York City and Albany because of the accident, and it is not clear when service may resume.