June 13 (Reuters) - A large explosion and fire hit the Williams Olefins chemical plant in Geismar, Louisiana, on Thursday, authorities said, causing at least some injuries.
A local fire department said it was treating a number of people injured in the blast, which occurred at a plant along the Mississippi River just south of Baton Rouge. Online images showed a large plume of smoke at the plant.
WAFB television in Baton Rouge reported seven injuries, citing the Iberville Office of Emergency Preparedness.
Corey Gautreaux, captain of City of Gonzales Fire Department, said emergency responders were treating people at the scene. There were no immediate reports of fatalities.
"It's an active scene. The fire department, the sheriff's office and hazmat (hazardous materials) team are responding to the explosion at the Williams Olefins plant," said Amy Johnson, a spokeswoman for the Ascension Parish Office of Homeland Security and Emergency Preparedness.
Local media said the fire broke out at around 8:30 a.m. and roadways had been closed.
The plant produces approximately 1.3 billion pounds of ethylene and 90 million pounds of polymer grade propylene, according to the Williams website. These chemicals are the basic building blocks in the petrochemical process used to make plastics.
Williams operates the plant and holds an 83 percent ownership interest in the Geismar facility, the company's website said.
Shares in parent company Williams Cos. fell by as much as 3 percent in early trading after the reports.
With massive equipment operating under intense pressure and high heat, the petrochemical industry is particularly prone to occasional fires and explosions, most of which are quickly brought under control with limited injury or damage.
Southern Louisiana is home to a large share of the country's petrochemical facilities and has seen at least two other blasts in the past two years.
Pressure on the industry to improve safety has increased since a blast at the Texas City refinery killed 15 people in 2005, among the worst such industrial accidents in decades.
A blast last month at a fertilizer plant in West, Texas, that killed 14 people has also sharpened attention on handling of volatile chemicals.
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