Breckenridge, CO – Fire investigators in Breckenridge say they know what caused a house to explode Wednesday afternoon just south of town in the Blue River community.

Investigators have determined that ice build up on the home’s propane tank regulator cause a pipe to break.It filled the house with gas, which then ignited. No one was inside at the time if the explosion.

Firefighters say a Denver doctor owns the property at 326 Mountain View Trail and used it as a second home.There is now little left, except the garage.