A fire investigator and two other workers stand near the remains of a structure, seen at rear through the trees, that exploded earlier as Lewisville fire fighters continue spraying wate

 

              A fire investigator and two other workers stand near the remains of a structure, seen at rear through the trees, that exploded earlier as Lewisville fire fighters continue spraying wate
A fire investigator and two other workers stand near the remains of a structure, seen at rear through the trees, that exploded earlier as Lewisville fire fighters continue spraying water on the smoldering 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)