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WEST, TX - APRIL 18: Smoke still rises from the rubble of a housenext to the fertilizer plant that exploded yesterday afternoon on April 18, 2013 in West, Texas. According to West Mayor Tommy Muska, around 14 people, including 10 first responders, were killed and more than 150 people were injured when the fertilizer company caught fire and exploded, leaving damaged buildings for blocks in every direction. (Photo by Erich Schlegel/Getty Images)
WEST, TX - APRIL 18: Smoke still rises from the rubble of a housenext to the fertilizer plant that exploded yesterday afternoon on April 18, 2013 in West, Texas. According to West Mayor Tommy Muska, around 14 people, including 10 first responders, were killed and more than 150 people were injured when the fertilizer company caught fire and exploded, leaving damaged buildings for blocks in every direction. (Photo by Erich Schlegel/Getty Images)

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    Cause of plant explosion 'undetermined'

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Cause of plant explosion 'undetermined'

Officials say they are still working to determine what caused the fertilizer plant explosion in West, Texas.

Cause of plant explosion 'undetermined'

Officials say they are still working to determine what caused the fertilizer plant explosion in West, Texas.