RedactedNarrative: Two witnesses, one of which was not on the vessel at the time of the incident provided the information contained in the report.  Vessel 1 was reported to have just left the dock when the engine began to run rough.  According to the witness not on the vessel, upon attempting to return to the dock, the engine back fired causing flames to come out from the engine cover and caused burns to at least two occupants.  The witness indicated that the vessel operator raised the engine cover and used his fire extinguisher on the engine and then closed the cover again.  All occupants were reported to have jumped into the water at that time to extinguish the flames on one of the victims'' shirts while the operator stayed on board and docked the vessel.  Both victims were so distraught about their injuries, that they were unable to provide additional information.  Both of the witnesses provided written statements, but were unable to provide additional details.  Upon LE and EMS arrival, the vessel had been retrieved from the water and left the area.  Attempts were made to contact the individual the witnesses indicated was the vessel owner.  The vessel owner has failed to return phone calls.  As the vessel was not available for inspection, officers were not able to determine the amount of damage that was done to the vessel.  No further information is available.