This followed a leak of crude oil from the Statfjord A loading buoy in the Norwegian North Sea, which is operated by StatoilHydro.
Provisionally estimated at 21,750 barrels (3,840 cubic meters), the Statfjord leak is the second biggest discharge of oil in Norwegian petroleum history.
The largest was the Bravo blow-out in 1977, which released about 75,000 barrels (12,000 cubic meters).
The PSA's role in an emergency is to supervise the operator's handling of the incident.
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