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This photo provided by Ryan Meador shows an explosion at The Williams Companies Inc. plant in the Ascension Parish town of Geismar La., Thursday, June 13, 2013. The fire broke out Thursday morning at the plant, which the company's website says puts out about 1.3 billion pounds of ethylene and 90 million pounds of polymer grade propylene a year. (AP Photo/Ryan Meador) ( Plant Explosion )

Fire billows from athe Williams Olefins Plant in Ascension Parish, La., on Thursday, June 13, 2013. Louisiana State Police are at the scene of the explosion and fire there are rreported several injuries as a result of the explosion. (AP Photo/The Baton Rouge Advocate, Catherine Threlkeld) ( Plant Explosion )

A Medevac helicopter lands at a triage center set up on highway LA 3115 near the Williams Olefins chemical plant, after an explosion and fire there, in Geismar, Louisiana June 13, 2013. An explosion and fire tore through the chemical plant in Geismar, Louisiana, on Thursday, injuring 33 people and leading authorities to order people within two miles (3 km) to remain indoors. REUTERS/Jonathan Bachman ( US-CHEMICALS/FIRE )

Smoke rises in the background at a road block near the Williams Olefins chemical plant, after an explosion and fire there, in Geismar, Louisiana June 13, 2013. An explosion and fire tore through the chemical plant on Thursday, injuring 33 people and leading authorities to order people within two miles (3 km) to remain indoors. REUTERS/Jonathan Bachman ( US-CHEMICAL/FIRE )