DENVER (AP) — A body was found Thursday night in the wreckage of a home that was leveled by an explosion that blew out neighbors' windows and knocked people off their feet in the Denver suburb of Thornton, a fire official said.
A rescue dog brought in by the Poudre Fire Authority of Fort Collins discovered the body as authorities picked through the shifting, smoking ruins, Lisa Wilson of the Thornton Fire Department told KMGH-TV.
Fire crews had said one person was unaccounted for after the explosion, which could be heard for miles. The two owners of the home told authorities the car and motorcycle of a third person who lived there were parked nearby, and they feared he was inside, the Denver Post reported.
It wasn't immediately known what caused the explosion.
City spokeswoman Lisa Wilson told the Post the response was in "recovery mode."
"The scene is unstable and there are hot spots, and so the investigators have to move very slowly," she said.
Video from television stations' helicopters showed little of the home remained standing, and debris was spread over nearby vehicles and homes as far as a block away.
"I was outside talking with my neighbor and it went right up — the insulation and the roof just went up in a big mushroom," Richard Sutton, who lives 1 1/2 blocks away, told the Post.
Neighbor Robert Lance Russel told KCNC-TV the blast knocked him and his son off their feet at their home across the street. Russel said they called out to see if anyone was in the debris but heard no response.
Todd Branson, who lives behind the home that exploded, said he was watching TV when he heard a boom.
"My back window just blew in, my screen door, the glass just totally blew in. When I had a chance to go out and see my back fence, my back fence was completely gone," he told KUSA-TV.
The explosion caused a fire amid the remains of the house, and it spread to a nearby tree. Residents with garden hoses tried to douse the blaze, which fire crews had under control soon after arriving in the neighborhood about 10 miles north of Denver.
Thornton Fire Department officials did not return calls for comment Thursday evening. The department's Twitter page said technicians were shoring up the destroyed house in order to improve the search conditions.
Xcel Energy spokeswoman Michelle Aguayo said utility crews were assisting in the investigation, but authorities have not been able to determine whether the explosion was the result of a natural gas leak or another cause.