File - In this April 17, 2013, file photo provided by Joe Berti, a plume of smoke rises after an explosion at West Fertilizer Company's fertilizer plant in West, Texas. Burglars occasionally sneaked into the plant in the years before its deadly explosion last month — sometimes looking for a chemical fertilizer that can be used to make methamphetamine, according to local law enforcement records. (AP Photo/Joe Berti, File)

Associated Press
File - In this April 17, 2013, file photo provided by Joe Berti, a plume of smoke rises after an explosion at West Fertilizer Company's fertilizer plant in West, Texas. Burglars occasionally sneaked into the plant in the years before its deadly explosion last month — sometimes looking for a chemical fertilizer that can be used to make methamphetamine, according to local law enforcement records.  (AP Photo/Joe Berti, File)
File - In this April 17, 2013, file photo provided by Joe Berti, a plume of smoke rises after an explosion at West Fertilizer Company's fertilizer plant in West, Texas. Burglars occasionally sneaked into the plant in the years before its deadly explosion last month — sometimes looking for a chemical fertilizer that can be used to make methamphetamine, according to local law enforcement records. (AP Photo/Joe Berti, File)
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