We had a garage two houses from us go up many years ago, My wife and i actually reported it and called our neighbor whose house was right next the garage to get him awake and out of the way. He started to get a hose and try to keep the fire off his house and then remembered the idiots might have had gas stored in there.
Luckilly the fire department got there pronto and got it knocked down quick before anything could blow. It is a really frightening sound when something gets going good. Tom