Emergency services attended to a cruise ship accident where reportedly five crew members died after falling overboard a cruise ship, during a routine emergency drill.
Television images showed a small, white two-hulled lifeboat capsized beside the ship.
It was not immediately clear if there were any other people in the lifeboat when it crashed into the sea, or whether the Thomson Majesty ship had any passengers on it.
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It comes after security was stepped up around the country following the Manchester Arena attack which killed 22 people.
A murderer nicknamed 'Houdini' after escaping the death penalty seven times has been given the lethal injection.
The distress signal sparked a police hunt in the area to find the person or group who made it.