Four people who died after a helicopter crash off Shetland have been named.
They were Duncan Munro, 46, from Bishop Auckland, Sarah Darnley, 45, from Elgin, Gary McCrossan, 59, from Inverness, and George Allison, 57, from Winchester.
Three of the four bodies have been recovered. Police Scotland confirmed 14 others were rescued.
The Super Puma L2 helicopter crashed two miles west of Sumburgh Airport at about 18:20 BST on Friday.
An investigation into the cause of the tragedy is under way.
RNLI rescue co-ordinator Jim Nicholson said the helicopter - carrying workers from an oil rig - apparently suffered a "catastrophic loss of power".
He said it appeared the aircraft had "suddenly dropped into the sea without any opportunity to make a controlled landing".
HM Coastguard Sue Todds said proximity and speed of rescue teams helped save lives at the wreckage.
Amanda Smith, whose son Sam was on the helicopter, told Sky News it suddenly lost power and those on board had "no time to brace". "He was by the window so he was able to escape that way as it rolled over," she said. "He said he had come off better than a lot of people, [those] were his words."
Michael Bull, whose son Samuel was rescued, said: "We understand he was on his way back from a rig and the helicopter lost power suddenly and immediately ditched into the water. "He managed to escape straight away because he was right by an exit and I understand soon afterwards that the helicopter turned over."
A total of 18 people were on board the helicopter.
The 14 survivors, including the two crew members, were taken to Gilbert Bain Hospital in Lerwick for treatment. Police Scotland said five were discharged a short time later and nine were detained overnight either for observation or suffering from exposure.
The ditched helicopter was found broken into several pieces up against rocks.
Boats, including a ferry and a cargo ship, joined lifeboat crews from Lerwick and Aith and helicopters from the coastguard, RAF Lossiemouth and two Bond rescue helicopters to search for survivors.
The AS332 L2 helicopter, carrying passengers and crew from the Borgsten Dolphin oil rig in the North Sea, was operated by CHC for Total, taking people to and from oil and gas installations.
A CHC spokesman said: "The aircraft was on approach to Sumburgh Airport at approximately 6.20pm when contact was lost with air traffic control."
Clockwise from top left: George Allison, 57, Sarah Darnley, 45, Duncan Munro, 46, Gary McCrossan, 59
In a later statement, the company said the cause of the incident was unknown but Super Puma L2 flights would be suspended worldwide.
"Also, in deference to the incident and the investigation, we are suspending all flights [on] Saturday by our UK operations," the company added.
Bond Offshore Helicopters also said it would not be operating any of its Super Puma aircraft fleet, with the exception of its Jigsaw rescue aircraft which would be available for life at risk missions.
Oil firm Total confirmed that the three men and one woman who died all worked for contract organisations.
Stork Technical Services confirmed one its employees, Gary McCrossan, was one of those who had died.
Mike Mann, a senior vice president at the firm, said: "Our heartfelt condolences go out to Gary's family and to all of those affected by this tragedy. We are doing all we can to assist the family at this difficult time."
Scotland's First Minister Alex Salmond paid tribute to the "brave and hard-working" people involved in the rescue effort.
He added: "Our thoughts at this difficult time are with the families, friends and colleagues of those who lost their lives in this tragic incident."
Oil & Gas UK's chief executive, Malcolm Webb, also offered his condolences, and said the incident had emphasised the importance of safety training.
"All offshore helicopter pilots undergo extensive training to prepare them for emergency situations and all passengers undergo regular helicopter evacuation training," he said.
He added that helicopter safety remained a focus for the industry, and any lessons that could be learned would be shared across the industry.
Last year, Super Puma helicopters crashed in two incidents, one off Aberdeen and another off Shetland, but these involved the EC 225 variety of the aircraft.
All passengers and crew were rescued in both incidents which were found to have been caused by gearbox problems.
Super Puma EC 225s were grounded following the crashes but were given the go-ahead to resume flying again earlier this month.
Bob Crow, general secretary of offshore union RMT, said there was a lack of workforce confidence in the Super Puma type aircraft, and unions had been working with the industry to address their members' concerns.