A unidentified worker and a fire investigator stand in front of the 

A unidentified worker and a fire investigator stand in front of the remains of an exploded structure as firefighters continue to spray water on the remains 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
A unidentified worker and a fire investigator stand in front of the remains of an exploded structure as firefighters continue to spray water on the remains 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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