FRESNO, California -- Fire officials in California say a man who was house-sitting for his parents set the home on fire after he used a blowtorch to kill black widow spiders.Thankfully, no one was injured in the fire, and firefighters say the man who initially called them made it out safely.It happened Tuesday night at a home in the Woodward Lake housing development in North Fresno.Fire crews say there was damage to the second-story of the home and the attic.Nearly 30 firefighters responded to the two-alarm fire and were able to put it out quickly.Although the exact cause has not been determined, fire crews believe the blowtorch is to blame.----------