It stated that smoking, sparking of electrical equipment, or frictionally ignited gas are among the probable igniting sources. About 75 escaped successfully, but two were killed in the last two larger explosions: Roy Westerfield, PEPCON's Controller who stayed behind to call the Clark County Fire Department; and Bruce Halker, the Plant Manager who stood near his car when the first major detonation occurred.
Roy Westerfield
Bruce Halker