National Transportation Safety Board

The NTSB (which stands for the National Transportation Safety Board) was an organisation used for investigation of accidents or attacks relating to various transportation across the United States.

Day 4
The NTSB was part of an investigation of the major attack of a train derailment that occurred at 7:02am of Day 4. There, they discovered that a man named Burke died from a gunshot wound, not due to injuries of the crash.