Three crewmen rescued from a capsized vessel off Shetland have been confirmed dead, while five remain missing.
Shetland Coastguard confirmed the deaths of the men, who were among 10 rescued from the handling supply tug Bourbon Dolphin 75 nautical miles north west of Shetland.
Five of their colleagues are thought to be trapped in the hull of the upturned boat.
The boat overturned at around 5.20pm on Thursday while undertaking an operation at the drilling rig Transocean Rather.
A coastguard helicopter search were stood down until first light while navy divers continue searching.
The other seven rescued crew were airlifted to Gilbert Bain Hospital in Lerwick, Shetland.
All 15 crew who had been onboard were Norwegian.
A Maritime and Coastguard Agency spokeswoman said: "Shetland Coastguard have now stood down the rescue helicopters. They will resume the search for the remaining five crewman again at first light, however the Search and Rescue operation will be changed to a Search and Recovery operation.
"A naval diving unit has been flown to the Transocean Rather platform and divers will be assisting in the continuing search throughout the night.
"All non-essential personnel were down-manned from the Transocean Rather platform as there is a very minimal risk that the capsized vessel could potentially damage the platform."
