A three-alarm fire that destroyed a South Salt Lake home flared up around 5:30 a.m. Thursday after being declared under control five hours earlier, authorities said.

South Salt Lake Fire Capt. John Nash said the cause of both the original blaze and the flareup was undetermined.The fire began in a home adjacent to Orion Hobby at 2770 S. Main at about 11:15 p.m. Wednesday. The owner of the shop and home, Greg Horrell, said Wednesday night that he heard what sounded to him like gunshots after the power went out in his shop.

Horrell ran to a neighbor's home to call police and was informed by another neighbor that his house was on fire.

A total of 20-25 firefighters from South Salt Lake, Salt Lake City and Salt Lake County fought the blaze from rooftops of warehouses along Main Street for about an hour before the fire was declared under control. Their task was made more difficult by limited access to the home and fire hydrants, as well as arcing power lines, Nash said.

The fire didn't damage Horrell's hobby shop, but scorched another building to the north, Nash said. Damages were estimated at $50,000.

South Salt Lake and county firefighters were still on the scene when the fire began anew and were able to bring it quickly under control again, Nash said.

No one was injured in the blaze, he said.