05/13/2015 01:19 pm ET Updated May 13, 2015

Horrific Photos Show Scene Of Deadly Amtrak Crash

Hours after the deadly crash of Amtrak Train 188 in Philadelphia, emergency crews worked to clean up the wreckage as investigators tried to to piece together what caused the deadly accident.

In the morning, large cranes arrived on the scene to lift and remove the derailed train cars, while authorities continued to search for passengers still unaccounted for.

Here are some of the poignant images to emerge.

Amtrak Train Crashes In Philadelphia Killing 6