Statoil has evacuated workers from its Karsto processing plant after a suspected gas leak.
The Norwegian operator said emergency services and authroties had been notified about the situation and it emergency response organisation had been established.
The gas leak is understood to have occurred in the Statpipe-facility where the gas pipelines connect to the facility for processing.
The company said the pressure has begun to fall and work is continuing on depressurising the facility.
All 250 staff members have been accounted for and a skeleton crew of 25 people have stayed at the facility to manage the incident.
Statoil said there may be visible flames from controlled burn-off gas from the three process flares at the facility while the incident continues.
The cause of the incident has yet to be determined.
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