Three Gravenhurst firefighters have been injured while battling a blaze at a trailer park off Highway 11 SB.  Gravenhurst Fire Chief Larry Brassard tells the Moose that around 10 this morning the department got a 911 call about a structure fire at Muskoka Mobile Home Park at 1701 Highway 11 SB. When they arrived, they found a well developed fire in one of the trailers and reports of someone trapped inside. Firefighters made an aggressive entry into the trailer and that’s when the injuries occurred. One firefighter was hurt after they fell on ice. Two others have been sent to hospital with burns.  When the Moose spoke with Brassard, the fire department still did not know if anyone was trapped inside. They are continuing to fight the blaze. More details as they become available.