What happened
During the en route phase of flight, the aircraft experienced an unknown technical malfunction. The nature of the failure was not specified in the available records, but it rendered the airframe unsafe to continue operations. In response to the emergency, the crew initiated an evacuation procedure. All four members of the flight deck abandoned the machine using ejection seats or parachutes. The crew survived the incident, while the unmanned aircraft subsequently impacted the ground and crashed.
Findings
The specific root cause of the technical failure has not been detailed in the source material. The primary outcome was the successful survival of all personnel aboard, despite the total loss of the airframe.