A search resumed this morning for a missing a Royal Navy Lynx helicopter, with four people on board, which disappeared yesterday evening.

The Lynx had itself been on a search mission after sailors on a RN frigate in the area, around 15 miles off the Lizard Peninsula in Cornwall, had reported hearing cries for help from the water.

The helicopter disappeared from the radar screens at about 7pm yesterday, and failed to respond to subsequent radio calls.

A Royal Navy spokesman said no mayday was received from the Lynx.

Several Royal Navy ships, including Type 23 frigates HMS Montrose and HMS St Albans, are taking part in the search, with aircraft carrier HMS Illustrious acting as on-scene commander.

Search and rescue helicopters from RN air station Culdrose, RAF aircraft and the Falmouth lifeboat were also involved in the search, and the French Navy have also provided assistance.

Conditions in the area are said to be relatively benign, and although the water is cold, the air crew will have been wearing protective clothing.

The Lynx is one of the mainstays of maritime aviation for the Royal Navy, and the aircraft has for many years provided the ship’s flight for deployed frigates and destroyers.