Shell said it is cooperating with US regulators on a investigation of an incident over the weekend in which two workers were killed at the Auger tension-leg platform in the deep-water US Gulf of Mexico.

The US Bureau of Safety & Environmental Enforcement as well as the US Coast Guard will kick off their review, and Shell will conduct its own internal probe as well, the company said.

The Anglo-Dutch supermajor said the incident took place at around 10 am local time on Sunday 30 June and occurred "during a routine and mandatory test of our lifeboat launch and retrieval capabilities," a spokesperson told Upstream via email Monday morning.