The cause of the enormous explosion at a house on Sunday, which could be heard miles away, was not immediately known. Officials described it as an “isolated incident.”

Multiple people were reported injured on Sunday when a two-story house collapsed in Austin, Texas after witnesses reported hearing a huge explosion, authorities said.

Around 11:30 a.m., emergency crews were called to a home explosion in the 10400 block of Double Spur Loop, near DK Ranch Road, the Austin Fire Department said. Crews with Austin FD, Austin police, Austin-Travis County EMS, and the Travis County Sheriff's Office responded.