A Scottish Government spokesman said:
We are aware that a helicopter has ditched in the North Sea, south of Sumburgh.
And we understand that all 19 people on board are now safe and well following the dispatch of emergency services to the site.
Scottish ministers are being kept updated on the situation and we will release further information when it becomes known.
More top news
Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Cheryl Grimmer vanished from inside a beach shower block in Wollongong, Australia, in 1970, when she was just three.
Pc Keith Palmer was on the front line and because of his actions, the Westminster attacker was unable to kill anyone else.