Smoke and an explosion were reported on Thursday at the flood-hit
Arkema SA chemical plant in Crosby, Texas, following floods caused by
Hurricane Harvey.
The company evacuated remaining workers at the damaged plant on
Tuesday, and Harris County ordered the evacuation of residents within a
1.5-mile (2.4-km) radius of the plant, which makes organic peroxides
used in the production of plastic resins, polystyrene, paints and other
products.
Houston TV station Fox 26 reported the explosion.
A police officer has been taken to hospital after inhaling fumes produced by the double blast.
"We want local residents to be aware that the product is stored in
multiple locations on the site, and a threat of additional explosion
remains," Arkema said in a statement.
"Please do not return to the area within the evacuation zone until
local emergency response authorities announce it is safe to do so," the
French company added.
The company had warned of a potential explosion in an update on its website on Wednesday afternoon.
Rich Rowe, its president and chief executive, said: "Our Crosby
facility makes organic peroxides, a family of compounds that are used in
everything from making pharmaceuticals to construction materials.
"But organic peroxides may burn if not stored and handled under the
right conditions. At Crosby, we prepared for what we recognised could be
a worst case scenario. We had redundant contingency plans in place.
"Right now, we have an unprecedented 6ft of water at the plant. We
have lost primary power and two sources of emergency backup power.
"As a result, we have lost critical refrigeration of the materials on
site that could now explode and cause a subsequent intense fire. The
high water and lack of power leave us with no way to prevent it."
Arkema submitted a plan to the federal government in 2014 outlining a
worst-case scenario that said potentially 1.1 million residents could
be affected by such an event over a distance of 23 miles, according to
information compiled by a nonprofit group.
The company said it had been using "multiple layers of preventative
and mitigation measures" at the plant, including steps to reduce the
amount of substances released.
That made the worst case—in which all controls failed and strong
winds blew toxic chemicals towards Houston, 25 miles away—"very
unlikely", it said.
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