However, the Texas City Office of Emergency Management said Loop 197 next to the Marathon Galveston Bay Refinery is expected to remain closed for the next two days as clean-up gets underway.
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Officials add all spilled crude oil was contained on site and is being removed and properly treated.
The leak began Wednesday morning, and it was blamed on the failure of a pump seal at the facility, according to Bruce Clawson, interim director of Homeland Security for Texas City. No injuries were reported.
The Marathon Galveston Bay Refinery has a refining capacity of 593,000 barrels of oil per day, according to company documents.
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It wasn't clear how much oil had spilled. Video from SkyEye showed a large amount of fluid spewing from a large tank at the site Wednesday.
"The refinery has deployed air monitoring in the community as a precaution, and there is no indication of risk to the community," Marathon Petroleum Corporation communications manager Jamal Kheiry said in a statement.
Kheiry also said an investigation is planned to determine what caused the spill.