Lewisville fire fighters stand by with equipment and water hoses as a worker uses a back hole tractor to dig a hole about 100 feet away from a structure that exploded earlier Friday, Jan. 11, 2013, in Lewisville, Texas. An explosion Friday in a North Texas neighborhood leveled a home that is part of a local nonprofit's affordable housing program, injuring at least three men and scattering debris.(AP Photo/Tony Gutierrez)

Associated Press
Lewisville fire fighters stand by with equipment and water hoses as a worker uses a back hole tractor to dig a hole about 100 feet away from a structure that exploded earlier Friday, Jan. 11, 2013, in Lewisville, Texas. An explosion Friday in a North Texas neighborhood leveled a home that is part of a local nonprofit's affordable housing program, injuring at least three men and scattering debris.(AP Photo/Tony Gutierrez)
Lewisville fire fighters stand by with equipment and water hoses as a worker uses a back hole tractor to dig a hole about 100 feet away from a structure that exploded earlier Friday, Jan. 11, 2013, in Lewisville, Texas. An explosion Friday in a North Texas neighborhood leveled a home that is part of a local nonprofit's affordable housing program, injuring at least three men and scattering debris.(AP Photo/Tony Gutierrez)
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