The Billings Fire Department responded Tuesday afternoon to a garage fire in the Heights.

Four engines, one ladder truck, a battalion chief unit and 17 firefighters quickly doused flames in a metal garage at 707 Wagner Lane at about 3:15 p.m.

Battalion Chief Dave Gilbert said a propane tank in the garage caught fire while crews worked to extinguish flames. Crews worked to contain the spread of the fire, cutting a hole in the back of the garage to get to the tank.

A camper-trailer parked next to the garage also caught fire when a propane tank inside the camper exploded.

The owner of the camper and next-door neighbor Shawnna Oblander said she was in the middle of feeding her 7-week-old when she heard pounding on her front door.

"My neighbors were pounding on the door frantically," Oblander said. "I had no idea flames were just feet from my home."

By the time she got her three kids out of the home, she said, the garage and camper were engulfed.

"With propane sitting in both the garage and camper, it was an accident waiting to happen," Gilbert said. "But that's where propane is stored."

Multiple propane tanks inside the garage vented and burned.

The fire did not spread to any other structures and no injuries were reported, Gilbert said.

The detached garage suffered major fire damage to the interior of the structure. All contents inside were a loss. A fifth-wheel camper-trailer parked next to the garage sustained major fire damage.

Assistant Fire Marshal Bill Tatum said the total estimated property and content loss is $70,000. The property and contents were insured.

The cause of the fire is unknown and remains under investigation.