Snowmobile fire - fire extinguishers?

[chipj29]

Originally Posted by dippasan

My sled caught fire last March in the Carrabassett Valley in Maine. My wife and I had just filled up with fuel. That being said there was NO WAY I was going to make any attempt to put it out. I did not want to get close to it. We knew that once the gas tank was breached it would get bad and it did.
The heat was so intense it started to make the trail side trees smolder a bit. We backed away 50' or so and watched it go up in disbelief. It was gone in an hour. The only thing left was the engine, some suspension parts and 108 pics.

Ouch, that hurts to see. Do you know what caused it?