[Gabrial]

“It’s hard for me to imagine how this could have happened without another party being involved.”

Bingo.

Most garage explosions in my area are caused by a combination of three things. 1) Improperly stored gasoline 2) a pilot light on a gas water heater, and 3) a sealed garage.

They don't happen when the garage door is open.

Before it happens, the garage REAKS of gas fumes. Any sane person would bug out the minute they smelled that much gas.

[rahbert]

sometimes cars catch fire because of crappy shade tree mechanic work. Every so often I see a modded car afire
by the side of the road. Probably not a likely scenario here
though.

Maybe the arsonist used the same method as Silvio when he torched Vesuvio.