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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)
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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Mayor: 'Clearly he was reckless and irresponsible'

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

Mayor: 'Clearly he was reckless and irresponsible'

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