Lewisville fire fighters drag hoses out from behind a structure that exploded 

Lewisville fire fighters drag hoses out from behind a structure that exploded earlier as work crews use a back hole tractor to dig in the area 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 drag hoses out from behind a structure that exploded earlier as work crews use a back hole tractor to dig in the area 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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