Shell PLC (LSE:SHEL, NYSE:SHEL) and Chevron both closed deepwater oil rigs in the Gulf of Mexico following what they said was a leak that took two pipelines offline.
Shell emphasised that the leak was small with the amount of oil released approximately two barrels and that it expected the pipelines to be back in service today.
A spokesperson told CNN it was "coordinating with local authorities and mobilising personnel and equipment to assess the situation".
Shell's Mars, Ursa and Olympus platforms were shut temporarily because of the leak. They produced an average of 202,000 barrels per day in 2021.
The "top priorities remain the protection of people, the community, the environment, and our assets", Shell said in its statement.
Chevron also closed three platforms.
Leaks in the Gulf of Mexico are especially sensitive after BP PLC (LSE:BP.)’s 2010 Macondo disaster, a huge spillage that saw 11 rig workers die and which cost more than an estimated US$65bn in compensation and to clean up.