RedactedNarrative: On Sunday, July 25, 2021, I, Game Warden 1 was on my way to Katherine's Landing for vessel patrol.  At approximately 1125, National Park Dispatched toned out a vessel explosion at Las Vegas Boat Harbor at D dock.  They reported the fire was out and 4 were injured.  National Park Service Rangers responded and began medical assessments and treatments.  I responded from US 95S to begin the investigation.  I arrived at approximately 1150 and began taking photos of the vessel.  The major portion of the damage was located under the helm areas on the port and starboard sides at midship.  After I was finished with photos, Las Vegas Boat Harbor Marina personnel towed the vessel to a more secure area at Lake Mead Marina.  The state Fire Marshall arrived at approximately 1510.  Together we looked through the vessel and determined that the explosion was accidental with an unknown cause.  The majority of the damage is cocentrated under both helms and under the deck.  There is very little damage on the exterior of the vessel.  
  
  All 4 of the injured individuals were transported to University Medical Trauma Center for treatment.  Victim was transported via helocopter and the other 3 by ambulance.  As of the writing of this, 8/2/2021, all are still in the hospital with burn injuries.