Spray from fire fighters water hoses and smolder rises off the top 

Spray from fire fighters water hoses and smolder rises off the top of the remains of a structure as a fire investigator and another person check out the scene 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
Spray from fire fighters water hoses and smolder rises off the top of the remains of a structure as a fire investigator and another person check out the scene 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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