At about 2353 Eastern time, the airplane overran the departure end of the runway during a takeoff attempt. The two crewmembers and two of the four passengers were fatally injured; the other two passengers suffered serious injuries. The aircraft, being operated as an on-demand passenger flight under Part 135, was destroyed by extensive post-crash fire. Weather was reported as clear with light winds. Tire debris and portions of airplane components were found along the 8600-foot runway. According to witnesses and initial information, the beginning of the takeoff roll appeared normal, then sparks were observed as the airplane accelerated. The airplane continued beyond the runway threshold and through the approximately 1000-foot-long runway safety area before impacting airport lighting, navigation facilities, a perimeter fence and concrete marker posts. It then crossed a roadway, and came to rest on an embankment on the far side of the road. The fire began on the airport side of the roadway.