Fuel oil is leaking from an empty 3,000 petrol tanker grounded on the east Cornwall coast and has formed a kilometre long slick.
The half-kilometre wide leak from the Cypriot vessel Willyis not causing concern at the moment, but discussions are under way on whether to put containing booms in place.
The Willy, which unloaded its petrol cargo in nearby Plymouth two days ago, still had 50 tonnes of its own fuel aboard when it ran aground at about 10.45 last night.
A Coastguard spokesman said an environmental group led by the Queen's Harbour Master - responsible for the sea area where the tanker grounded - were currently holding talks in Plymouth.
The fuel vapour was borne ashore in the bitter south easterly wind and could be tasted in the air, and Mr Wong said the risk of an explosion was still present after a crack appeared in the vessel.
About 150 people were evacuated from their homes because of the potential danger from an explosion. Many went to the village hall.
The vessel, which had been at anchor in Cawsand Bay after discharging her cargo, went aground in south easterly gales, and the 12 crew were taken off.
PA