Both the Ministries of Labour and Environment have been called in to help investigate an explosion on a boat at the Minaki Marina.
Ontario Provincial Police say the incident took place on Friday evening just before 6:00 and involved a boat that was being refueled.
The five meter long Hurricane can hold up to 200 liters of gas, but the hull filled with 360 liters of fuel after a gas line broke.
Police say the boat exploded after the operator tried to start it up.
Two people remain at Lake of the Woods District Hospital with second degree burns, while three others have been treated and released.