Launched on the 4th of July

Three young men in Oklahoma were enjoying the coming Fourth of July holiday and wanted to test fire some fireworks. The only real problem was, their launch pad and seating arrangements were atop a several hundred thousand gallon fuel distillation storage tank. Oddly enough, fumes were ignited, producing a fireball seen for miles. They were launched several hundred feet into the air and found dead some 250 yards from their respective seats.