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In this April 18, 2013 file photo, smoke rises near a fertilizer plant that exploded earlier in West, Texas, the night before. Four weeks after the explosion, investigators have yet to announce what prompted the fire and touched off the massive explosion

In this April 18, 2013 file photo, smoke rises near a fertilizer plant that exploded earlier in West, Texas, the night before. Four weeks after the explosion, investigators have yet to announce what prompted the fire and touched off the massive explosion