A firefighter pauses while surveying the blast zone destroyed by an explosion at a fertilizer plant during search and rescue efforts in West, Texas, Thursday, April 18, 2013. A massive explosion at the West Fertilizer Co. killed as many as 15 people and injured more than 160, officials said overnight. (AP Photo/LM Otero)

Associated Press
A firefighter pauses while surveying the blast zone destroyed by an explosion at a fertilizer plant during search and rescue efforts in West, Texas, Thursday, April 18, 2013.  A massive explosion at the West Fertilizer Co. killed as many as 15 people and injured more than 160, officials said overnight.  (AP Photo/LM Otero)
A firefighter pauses while surveying the blast zone destroyed by an explosion at a fertilizer plant during search and rescue efforts in West, Texas, Thursday, April 18, 2013. A massive explosion at the West Fertilizer Co. killed as many as 15 people and injured more than 160, officials said overnight. (AP Photo/LM Otero)
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