TEXAS CITY, Texas (AP) - Authorities say no one has been hurt in a transformer fire at a Houston-area chemical plant in an accident generating dark smoke that for a time obscured the sky.

The Galveston County Daily News reports officials are seeking the cause of Tuesday's fire at an Ashland plant in Texas City, 35 miles (55 kilometers) southeast of Houston. An Ashland spokeswoman didn't immediately return messages Wednesday.

The Texas City Fire Department says there was no threat to the community. Texas City Emergency Manager Tom Munoz says the fire was quickly contained and about 4,000 gallons (15,140 liters) of mineral oil was allowed to burn off. The oil produces dark smoke when ablaze.

Texas City is in Galveston County. Neighboring Harris County has had several fiery chemical plant-related accidents since March.

Information from: The Galveston County Daily News, http://www.galvnews.com

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