Shell Arctic oil rig rescue postponed amid huge waves
Attempts to rescue a Shell drill rig grounded off the Alaskan coast have been delayed because of high seas and strong winds.
The rig, named Kulluk, ran aground on Monday after drifting in stormy weather as it was being towed.
The rig is grounded on the south-east side of Sitkalidak Island.
The US Coast Guard said the rig, carrying about 143,000 gallons of diesel and about 12,000 gallons of other oil products, appears stable.
BBC environment analyst Roger Harrabin reports