Four dead in helicopter crash
24 August 2013 Last updated at 22:48 BST
Air accident investigators have arrived on Shetland to try to establish why a helicopter crashed while returning sixteen workers from an oil rig, killing four.
The Super Puma helicopter came down in the sea west of Sumburgh Airport on Friday evening - after an apparent catastrophic loss of power.
The other passengers and crew were treated at a local hospital after being rescued from the water.
Laura Bicker reports.