The explosion occurred at a home in Charles Town, near the border with Maryland and Virginia, around 1 p.m., Fox 5 DC reported.

Witnesses told the station that the homeowners were having problems with their propane furnace on Sunday. A technician reportedly arrived at the home Monday to fix the propane furnace and smelled gas.

The homeowner and the technician were taken to an area hospital with non-life-threatening injuries, Fox 5 reported, citing witnesses. There were reportedly two teenage boys who were home during the explosion, but they were unharmed.

Photos and video footage from news outlets show firefighters dousing the remnants of a fire at the leveled house. Fire officials said they were trying to determine what caused the explosion.

A message left with Charles Town’s fire department wasn’t immediately returned.