Investigators look through the debris of the destroyed fertilizer plant in West, Texas, Thursday, May 2, 2013. Investigators face a slew of challenges in figuring out what caused the explosion at the ... more 
Investigators look through the debris of the destroyed fertilizer plant in West, Texas, Thursday, May 2, 2013. Investigators face a slew of challenges in figuring out what caused the explosion at the fertilizer plant that killed 14 people and destroyed part of the small Texas town. (AP Photo/LM Otero, Pool) less 
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Associated Press | Photo By LM Otero, Pool
Thu, May 2, 2013 4:25 PM EDT