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Cause of Texas fertilizer plant blast 'undetermined'

An aerial picture shows the devastation at a fertilizer plant in West, Texas, on April 25, 2013. The cause of a deadly explosion at a fertilizer plant that destroyed much of West, Texas remains "undetermined" but officials said a criminal investigation wiThe cause of a deadly explosion at a fertilizer plant that destroyed much of West, Texas remains "undetermined" but officials said Thursday a criminal investigation will continue. "An undetermined cause occurs when the cause cannot be proven to an acceptable level of certainty," State Fire Marshal Chris Connealy told reporters.