BBC: A pipeline system servicing up to 27 oil fields has been shut down after a leak on the Cormorant Alpha platform, north-east of Shetland.
The fields affected, and another eight associated platforms, produce about 10% of the UK's oil output.
Hydrocarbons were detected inside a leg of the Cormorant Alpha platform.
Its operator, Taqa Bratani, has removed non-essential workers as a precaution and said the leak had been contained.
Shutting down the platform affects the whole Brent pipeline...