The family - Sean Griffiths and Jennete Kealy and their four children - were not injured in the blast, which blew out several windows early Sunday.
Neighbor Carol Rutledge said she was watching television when the explosion shook the neighborhood about 2 a.m.
``I heard the boom. I thought somebody was messing around in my yard,'' she said. ``I turned off the lights and went around to the front and the back to see if I could see anything.''
A few minutes later, she heard the fire trucks pulling up.
``So much smoke was coming out that I couldn't see,'' she said.
Another neighbor, Sara Harvey and Mack Hayes, also were watching TV.
``It was about five minutes before the end of the movie. It scared the daylights out of us,'' Hayes said.
Harvey said that she heard two blasts, and thought the sound might be fireworks. Then the couple from next door came running over with their children.
Griffiths, who works on air conditioners, uses the gas cylinders in his job. Several cylinders lay in the yard after the explosion.
Davenport District Fire Chief Bart Howard said that the cause of the blast remains unknown, and that several items from the wreckage will be examined at a laboratory.
Information from: Quad-City Times
