That kinda seems not mechanical. Which, admittedly is probably good - cause it feels like a fire in the mountain would be potentially very, very bad.
I know some Jedi can create a flame in the Force if they need to - or at least some can. Also there's all the people who do other magical stuff. But I don't know that there would be any way to tell that after the fact. Maybe with some magic there is, but I don't think I could with the Force - it isn't Dark Side, so it isn't likely to leave that feel behind.