David Hainsworth of Total E&P UK, which operates the Elgin PUQ oil rig, admitted that the release of gas could go on "for a significant period of time". He said:
The gas is flammable but the platform power was turned off to minimise risk of ignition, but clearly there is a risk. We have taken away a series of risks but there is always a possibility, it's low but you never say never. The best-case scenario is that the gas in this area is not very productive and it dies off in the coming days and weeks. At the moment there is no real evolution of the sheen on the sea but if that was to change - and it's monitored on a daily basis - then the exclusion zone may be increased, but at the moment it will probably stay the same.
More top news
World Superbike champion and TV presenter joined thousands of other bikers at an event to raise money for the Midlands Air Ambulance.
Spring takes a hike - for the time being
A number of Britons are feared stranded on Mount Everest after the Nepal earthquake triggered a deadly avalanche on Saturday.