Oregon State troopers are investigating a dramatic fatal truck accident on Highway 26 near Warm Springs that shut down the highway for two hours Tuesday morning.  The truck was loaded with highly flammable aviation fuel; it hit the guardrail, tumbled down into the canyon, and caught on fire. Oregon State Police say the truck and trailer was loaded with 8300 gallons of aviation fuel. It smashed into the guardrail for about 100 feet before breaking thru and then falling 200 feet down the into the canyon. ODOT's Peter Murphy has more details: “It exploded; it burst into flames.  I guess it had aviation fuel, which is pretty volatile. Once it gets going its pretty hot; so the truck became fully engulfed. And in addition to that it set a small fire there in the wildland, on the downhill side of the highway as people descend on the east side of the Deschutes River." Crews were able to quickly put out the wild land fire. State troopers confirm the driver was inside the wreckage, which was totally destroyed in the crash.