May 16, 2015 9:49 AM EDT

Amtrak president and CEO Joe Boardman addressed the deadly Philadelphia derailment of train 188 that killed eight people in a letter sent to Amtrak customers on Friday. “With truly heavy hearts, we mourn those who died,” Boardman’s letter reads. “Amtrak takes full responsibility and deeply apologizes for our role in this tragic event.” The National Transportation Safety Board and FBI are investigating the incident.

See the full letter below:

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