Unresponsive Plane Triggers Fatal Crash and Military Response near DC.

Federal investigators are looking into the cause of a plane crash that occurred near the US Capitol region on Sunday, which prompted military fighter jets to intercept the aircraft before it crashed in northern Virginia, killing all four people on board. The F-16 fighter jets were authorized to travel at supersonic speeds, causing a sonic boom across the Washington, DC, area. The details of why the plane veered so far off course and what caused the crash are still unclear. The National Transportation Safety Board is expected to arrive at the crash site on Monday to begin the investigation.