Valero Energy Corp said on Thursday that an unknown amount of oil product had spilled into the Milford Haven waterway in Pembroke in Wales.
"Valero is working in coordination with response agencies to contain the effects from the release of oil," it said in an emailed statement.
Valero operates the 220,000 barrel per day Pembroke oil refinery.
(Reporting by Ahmad Ghaddar Editing by Edmund Blair)
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