Red BankTN- Red Bank fire investigators are still trying to pinpoint the exact cause of a blaze that broke out in an Old Trail home following an explosion in its furnace room this morning, said Hamilton County Emergency Services spokeswoman Amy Maxwell.

No one was injured in the blaze, which started around 9:15 a.m. at 5023 Old Trail, Ms. Maxwell said.

The homeowner’s son reported turning on a propane-fed furnace before hearing a “large explosion that shook the house,” she said in a news release. “He proceeded to go downstairs to check the pilot light in the furnace room, opened the door and met with heavy smoke and fire.”

Firefighters with the Red Bank Fire Department were able to contain the flames before they reached the upstairs level of the house, Ms. Maxwell said.