What happened
The incident occurred during the initial phase of flight operations on a paved surface. As the aircraft accelerated down the runway for departure, it crossed over an intersecting runway. During this maneuver, the aircraft experienced a sudden vertical movement, described in the source as catapulting slightly. This motion caused one of the doors to pop open unexpectedly.
Recognizing the situation, the pilot initiated an abort of the takeoff procedure. The pilot attempted to bring the aircraft back under control and set it down onto the runway surface. However, the aircraft continued its forward momentum beyond the designated end of the paved area.
The plane rolled off the end of the runway and collided with a fence. Following this impact, the aircraft struck a passing automobile. That vehicle then proceeded to hit a van. The aircraft ultimately came to rest just short of a concrete fence, having caused damage to itself and involved multiple other vehicles in the incident.