Motiva Enterprises reported emissions at its massive refinery in Port Arthur, Texas.
"The Motiva Port Arthur Refinery experienced a loss of primary containment that resulted in air emissions to atmosphere," the refinery said in a statement to the Texas Commission on Environmental Quality.
It said the emissions began Tuesday morning and lasted 12 hours.
The 600,000-barrel-a-day refinery is located 90 miles east of Houston. Motiva is a joint-venture between Shell and Saudi Aramco.
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(END) Dow Jones Newswires
April 26, 2017 09:11 ET (13:11 GMT)