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THORNTON, Colo. — Investigators say one person was inside a house in Thornton when a massive explosion destroyed it Thursday afternoon. That person has not been found and was believed dead. Crews with cadaver dogs were searching through the rubble of the home looking for the man’s body late Thursday night. The homeowner told police there was a vehicle at the house that indicated a person was inside at the time of the explosion. The home, located at 13072 Monroe Drive, was obliterated, spraying debris more than a block away and showering pink insulation onto rooftops. The Thornton Fire Department confirmed a structure fire in the area about 3:06 p.m., while witnesses reported feeling the ground shake and seeing a smoke plume at the same time. RAW VIDEO: Explosion rocks Thornton neighborhood Neighboring homes showed signs of serious damage. Utilities and fire officials were trying to determine whether the explosion was caused by gas or something else. Twenty firefighters responded, TFD said. A lingering fire was extinguished by 4:30 p.m. Numerous roads in the neighborhood were closed.