Perenco has shut in a platform off the UK after a worker died following an incident on board earlier this week.
The operator said the Indefatigable 23A (Inde 23A) platform in the southern North Sea has been shut in and gas supplies halted following the death after an unspecified incident on Monday.
A spokesman for the Norfolk Constabulary told Upstream: "Officers were called at 12.55pm (on Monday) to reports that a man had been flown to the Norfolk and Norwich University Hospital with serious injuries but sadly died later.
"At this stage it is being treated as an industrial incident and enquiries are under way to establish the events leading up to the man’s death."
A spokesman for Perenco said the company is “working closely with the Health & Safety Executive (HSE) and other relevant authorities to investigate the circumstances” of the incident.
“We are doing all we can to support the man’s family in these difficult times,” the spokesman added.
A spokesperson for the HSE said it is investigating alongside the police, which is leading inquiries.
The Inde 23A platform is situated around 112 kilometres offshore in Block 49/23 and is one of seven manned platforms Perenco operates in the UK southern sector.
The others are Indefatigable 23C, Thames 28A, Leman 27A, Cleeton, Ravenspurn North CPP and West Sole Alpha.
The private company also operates 38 normally unattended installations and 14 subsea installations producing gas and liquids that are tied-back through pipelines to onshore gas terminals at Dimlington, Theddlethorpe and Bacton.