A search is underway for a missing helicopter with five people on board in the Caernarfon Bay area.
Air traffic control lost contact with the red twin engined squirrel chopper this afternoon as it travelled from Milton Keynes to Dublin.
Two Welsh search and rescue helicopters are currently combing the sea.
The UK Coastguard said poor weather conditions are hampering the search and the rescue helicopters have now returned to their respective bases.
They said there are no plans to continue the aerial search unless the weather improves significantly.
North Wales Police and mountain rescue teams have taken over the search and rescue operation to continue the land based search in the Snowdonia area.
They were notified at 4.15pm to start an operation.