A sign is seen on a pickup window as it passes near the ruins of the West Fertilizer Co. Sunday, April 21, 2013, four days after an explosion at the plant in West, Texas. The massive explosion Wednesday night killed 14 people and injured more than 160. (AP Photo/Charlie Riedel)

Associated Press
A sign is seen on a pickup window as it passes near the ruins of the West Fertilizer Co. Sunday, April 21, 2013, four days after an explosion at the plant in West, Texas. The massive explosion Wednesday night killed 14 people and injured more than 160. (AP Photo/Charlie Riedel)
A sign is seen on a pickup window as it passes near the ruins of the West Fertilizer Co. Sunday, April 21, 2013, four days after an explosion at the plant in West, Texas. The massive explosion Wednesday night killed 14 people and injured more than 160. (AP Photo/Charlie Riedel)
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