The fire investigator and the major crime unit are now on scene trying to determine what caused the fire early this morning.
City Police, KV Fire and Saint John Fire Department have been on scene at 2720 Golden Grove Road since 3:00 am.
Saint John Fire says three KV firefighters were on the second floor deck when it collapsed, leaving one firefighter hanging and sending two others to the ground -- suffering minor injuries.
Police say the owners were camping in Sussex at the time of the fire. Police add there are no neighboring houses near the blaze.
There's no word on what caused the fire.
