Firemen said there were chewed wires and a dead raccoon up there, two other raccoons escaped. Neighbor does not know how they got in. I would think it raccoons were in your attic you would know it, you'd hear them moving around. I guess unless you have all your wiring in metal conduit, this is a hazard. Maybe would not have been a fire if he had ground fault protection on the circuit. Of course that only tripps if the raccoon grounds, but if the raccoon is on wood and it does not leak to ground the circuit would act as if a toaster were in operation.