Investigators at the house. (SUSAN BIDDLE/FOR THE WASHINGTON POST)

The adult male and adult female were rushed to the burn unit of a local hospital after the blast, which occurred around 3 a.m. in the 11200 block of Ashley Drive, said Assistant Chief Scott Graham. The male has non-life threatening injuries, while the female is suffering from life-threatening injuries.

The cause of the explosion is under investigation by the Montgomery County fire department and local utility companies.

Miata Sherman, who lives two doors down, said her house shook when the explosion occurred. It woke her up and she feared a tree had fallen on her roof.

“We ran out and saw a ball of fire,” Sherman said. “There was nothing left of the house.”

The explosion was powerful enough to cause minor to moderate damage to neighboring homes and blow debris into nearby trees and for “50 yards in any direction,” Graham said. Sherman said many of the windows in one of the damaged homes were blown out. She said she saw doors and windows scattered around the block.

The injured man and woman were found amid debris in the rear of the home, Graham said. They had moved into the home recently, Graham and Sherman said. No one else was injured in the blast.

Earlier this week, a Dumfries home was leveled by an explosion that was believed to be caused by a gas leak.

Here’s a story from last October about how development in once-rural areas has put neighborhoods closer to natural gas pipelines.

Two nearby homes were also damaged. (SUSAN BIDDLE/FOR THE WASHINGTON POST)