More than 100 workers have been evacuated from a North Sea platform as a precaution.
EnQuest said it "proactively initiated emergency response procedures" at the Thistle Platform on Monday evening.
The move came after a preliminary subsea structural inspection. The platform has been safely shut down, the company said.
The coastguard said that a coastguard helicopter and two rescue aircraft from the Norwegian off shore sector have been transferring 115 personnel to other platforms in the area. They are all safe and well.
The Thistle Platform is located around 125 miles north east of Shetland.
Coastguards said they were made aware of the incident at around 6.30pm on Monday.
In a statement, EnQuest said: "EnQuest can confirm it has proactively down-manned the Thistle platform today in a precautionary move following a preliminary subsea structural inspection today. All 115 personnel were transferred to a nearby platform by helicopter.
"The platform has been safely shutdown in accordance with planned procedures.
"EnQuest is liaising with all relevant authorities including the Maritime and Coastguard Agency.
"The Thistle Platform is located approximately 125 miles North East of Shetland in North Sea block 211/18.
"Further information will be released as soon as it becomes available."
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