DANBURY, Conn. (AP) -- An explosion that leveled a liquor store, killing two people and injuring 10 others, was caused by the ignition of gasoline fumes from a stream that ran under the building, investigators said Friday. The blast Wednesday leveled most of the two-story building, which housed Venancio's Wine & Liquor on the first floor and three apartments above. ``I never saw anything like it. It was like the whole roof lifted up and fell on the sidewalk,'' said Ed Pryblski, whose brother, Michael, co-owns the liquor store. Officials believe that gasoline fumes from the stream came into the liquor store through pipe holes in the bathroom floor. The fumes were ignited by the pilot light of a ceiling-mounted, gas-fired heater. The ignition caused two separate explosions -- one in the store and one under the building --and started a fire, Deputy Fire Marshal Francis Curran said. Investigators theorize that recent rains could have elevated the water level and forced vapors to rise in the building. Investigators were still trying to find the source of the gasoline. Shortly after the blast, rescuers dug through the rubble for hours Wednesday night for two men they knew were trapped in the building. One man did not survive, but a 36-year-old store employee, Jeffrey Keeler, was found alive pinned against a wall under burning debris. He was in critical condition at a hospital. Investigators, using police dogs and heavy machinery to move debris, later pulled a second body from the rubble. Ten others were hospitalized for non-life threatening injuries. -=-=- 