An Alabama ambulance driver who died at the scene of a fiery crash Thursday appears to have died from a medical emergency he suffered while driving just before the crash, Alabama state troopers reported Friday.

The single-vehicle crash involving an ambulance occurred at approximately 3:35 p.m. Thursday, trooper said.

As a result of the crash two women were hospitalized.

Ruby D. Collins, 63, of Troy, the patient, and Hannah L. Sumner, 28, of Dothan, the on-board paramedic, were both injured when the 2014 Ford E-350 ambulance, in which they were passengers, left the roadway, struck a ditch and a tree before becoming engulfed in flames.

Collins was transported to Flowers Hospital in Dothan; Sumner was transported to Southeast Alabama Medical Center also located in Dothan.

The driver of the ambulance Robert L. Parrish, 70, of Cowarts, suffered a medical emergency while driving before the crash occurred and his cause of death was determined to be unrelated to the collision, troopers said.

However, Parrish was pronounced deceased at the scene. The crash occurred on U.S. 231 near the 62 mile marker, approximately three miles south of Brundidge, in Pike County.