Chemicals have been released into the atmosphere from a flood-damaged plant near the storm-hit US city of Houston, local officials say.
Earlier, black smoke was seen issuing from the Arkema chemical plant at Crosby.
A police officer who was helping secure the site was taken to hospital after inhaling fumes, while nine others admitted themselves as a precaution.
Arkema said this was believed to have been caused by a “non-toxic irritant”.
Harris County sheriff Ed Gonzales said the release was not believed to have been a result of an explosion, despite earlier reports of blasts.
Residents living within a 1.5-mile (2.4km) radius of the plant were evacuated after the company warned there was a risk of explosions and fire.
During heavy rainfall from Hurricane Harvey, the complex lost the ability to refrigerate chemical compounds that need to be kept cool.
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