I have always wondered how they can figure out how a fire started? What different sign is there from say spontaneous combustion, a lightning bolt, or a hot tail pipe?
They rely on when and where it is reported initially,, areas that are most suspect will be examined closely for telltale signs or evidence,, fire&forest forensic scientists.. could have just been a rock off of a mower blade ,, they’re pretty good at it. they get a lot of practice lately.