Mayor: ‘Clearly he was reckless and irresponsible’

PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday May 13, 2015 in north Philadelphia, Pennsylvania. At least six people were killed and more than 200 others were injured in the crash. (Photo by Win McNamee/Getty Images)

Mayor: 'Clearly he was reckless and irresponsible'

Situation Room

Philadelphia Mayor Michael Nutter says that the engineer of the train that derailed was clearly "reckless and irresponsible in his actions."

07:18 - Source: CNN

Amtrak train derailment in Philadelphia 45 videos

PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday May 13, 2015 in north Philadelphia, Pennsylvania. At least six people were killed and more than 200 others were injured in the crash. (Photo by Win McNamee/Getty Images)

Mayor: 'Clearly he was reckless and irresponsible'

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The windshield of the train may have been hit by something before the crash. The area of interest is the circular mark on the right side of the windshield.

FBI examining what struck Amtrak train's windshield

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Investigators looking at marking on Amtrak 188 train

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The windshield of the train may have been hit by something before the crash. The area of interest is the circular mark on the right side of the windshield.

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Emergency personnel work at the scene of a deadly train wreck, Wednesday, May 13, 2015, in Philadelphia. More than 200 people aboard the Washington-to-New York train were injured in the derailment that plunged screaming passengers into darkness and chaos Tuesday night. (AP Photo/Patrick Semansky)

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Caption:PHILADELPHIA, PA - MAY 13: Repair crews inspect damages at the site of a train derailment accident May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after an Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by Alex Wong/Getty Images)

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Caption:PHILADELPHIA, PA - MAY 13: Repair crews inspect damages at the site of a train derailment accident May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after an Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by Alex Wong/Getty Images)

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PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday May 13, 2015 in north Philadelphia, Pennsylvania. At least six people were killed and more than 200 others were injured in the crash. (Photo by Win McNamee/Getty Images)

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PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of an Amtrak passenger train carrying more than 200 passengers from Washington, DC to New York that derailed late last night May 13, 2015 in north Philadelphia, Pennsylvania. At least five people were killed and more than 50 others were injured in the crash. (Photo by Win McNamee/Getty Images)

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PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of an Amtrak passenger train carrying more than 200 passengers from Washington, DC to New York that derailed late last night May 13, 2015 in north Philadelphia, Pennsylvania. At least five people were killed and more than 50 others were injured in the crash. (Photo by Win McNamee/Getty Images)

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Emergency personnel gather near the scene of a deadly train wreck, Wednesday, May 13, 2015, after a fatal Amtrak derailment Tuesday night, in the Port Richmond section of Philadelphia. Federal investigators arrived Wednesday to determine why an Amtrak train jumped the tracks in a wreck that killed at least six people, and injured dozens. (AP Photo/Mel Evans)

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PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of an Amtrak passenger train carrying more than 200 passengers from Washington, DC to New York that derailed late last night May 13, 2015 in north Philadelphia, Pennsylvania. At least five people were killed and more than 50 others were injured in the crash. (Photo by Win McNamee/Getty Images)

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PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday May 13, 2015 in north Philadelphia, Pennsylvania. At least six people were killed and more than 200 others were injured in the crash. (Photo by Win McNamee/Getty Images)

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PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of an Amtrak passenger train carrying more than 200 passengers from Washington, DC to New York that derailed late last night May 13, 2015 in north Philadelphia, Pennsylvania. At least five people were killed and more than 50 others were injured in the crash. (Photo by Win McNamee/Getty Images)

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Rail torn up under derailed Amtrak car

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Passengers of an Amtrak train that crashed gather Tuesday, May 12, 2015, near Philadelphia. Train 188 was traveling from Washington to New York City.

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A train derails in Philadelphia.

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Former U.S. Rep. Patrick Murphy tweeted he was aboard the train when it crashed. "Helping others," he said. "Pray for those injured." Later he shared this photo that showed a firefighter inside the train.

Amtrak train derails in Philadelphia

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