RedactedNarrative: On June 16, 2018, operator was operating LA vessel 6538FP (Vessel 1) on Cypress Lake in Bossier Parish.  Operator had 8 other people on board besides himself.  Operator had been pulling a tube behind vessel 1 approximately an hour when he stopped and turned the engine off to change out the people on the tube.  He stopped about 40 feet off the bank.  Operator stated when he went to turn the ignition to start vessel 1 the vessel exploded. 
  
   Everybody on board was thrown from Vessel 1 except one person, but she was forced into the water because the vessel was fully engulfed in flames.  Some of the people on board were able to make it to the bank.  The others were picked up by passing vessels and taken to Cypress Lake Park.  The vessel fire was put out by Benton Fire Department.  
  
  Operator was transported to University Health in Shreveport and found to have 2 broken vertebrae.  One subject had no injuries.  Victim4 was transported to a local hospital and found to have a laceration on her head and a bite through her tongue.  Victim2 had a sprained ankle.  Victim3 had a fractured back and numerous burns.  
  
   Vessel 1 was remote steer and found to have ten Type 3 PFDs on board.  Everybody on board was wearing a PFD except Operator and his wife.  Alcohol and drugs are not suspected in this incident.  After an examination by our department and the Benton Fire Department the cause of the explosion was undetermined.  Vessel 1 was a complete loss.  The explosion and ensuing fire burned the vessel to the hull.  Photographs were taken of vessel 1.  I believe the contributing factors in the incident are:  1.  Ignition of spilled fuel or vapor.  2.  Operator Inattention.  
  