AP Photo/Patrick Semansky

The latest images from Philadelphia, where Tuesday night’s Amtrak derailment has left at least six dead and dozens injured.

The cause of Tuesday night’s Amtrak passenger train derailment in north Philadelphia is still unknown. Dozens were injured and six killed among the 243 passengers and crew who were on board Northeast Regional Train 188, which was traveling from Washington, D.C. to New York City.  

NTSB officials arrived at the scene this morning. Hundreds of police and firefighters were at the crash site late last night along with dozens of F.B.I. and Department of Homeland Security officials, according to the New York Times.

Amtrak service between New York and Philadelphia is suspended today. Philadelphia mayor Michael Nutter says it’s likely service will remain suspended the rest of the week. Having just returned from the crash site, the mayor told reporters late last night, “[i]t is an absolute disastrous mess. I have never seen anything like this in my life.”

Emergency personnel work the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. (AP Photo/ Joseph Kaczmarek)
Emergency personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia.  (AP Photo/ Joseph Kaczmarek)
Emergency personnel work the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. (AP Photo/Joseph Kaczmarek)
Emergency personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia. (AP Photo/ Joseph Kaczmarek)
Emergency personnel work the scene of a deadly train wreck, Tuesday, May 12, 2015, in Philadelphia.  (AP Photo/ Joseph Kaczmarek)
Emergency personnel work the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. (AP Photo/Joseph Kaczmarek)
A crime scene investigator looks inside a train car after a train wreck, Tuesday, May 12, 2015, in Philadelphia. (AP Photo/Joseph Kaczmarek)
Emergency personnel help a passenger at the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. (AP Photo/Joseph Kaczmarek)
Emergency personnel work the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. (AP Photo/ Joseph Kaczmarek)
Emergency workers survey the remains of a derailed Amtrak train in Philadelphia, Pennsylvania May 13, 2015. REUTERS/Lucas Jackson
Emergency workers survey the remains of a derailed Amtrak train in Philadelphia, Pennsylvania May 13, 2015. (REUTERS/Lucas Jackson)
Men walk towards the site of a derailed Amtrak train in Philadelphia, Pennsylvania May 13, 2015. (REUTERS/Mike Segar)
Officials meet at the site of a derailed Amtrak train in Philadelphia, Pennsylvania May 13, 2015. Rescue workers searched through the debris on Wednesday for more victims of an Amtrak passenger train wreck in Philadelphia that killed six people and injured scores others as investigators sought to determine the cause of the derailment. (REUTERS/Mike Segar)
Philadelphia Mayor Michael Nutter, center right, hugs Lori Dee Patterson, a nearby resident, after she handed him a cup of coffee after he spoke at a news conference near the scene of a deadly train derailment, Wednesday, May 13, 2015, in Philadelphia. (AP Photo/Matt Slocum)

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