Six Royal Navy sailors have been taken to hospital after accidentally inhaling nitrogen gas.

They were participating in a training exercise aboard a warship docked at Faslane naval base on Wednesday when a fire suppression system was activated by mistake.

Six members of the crew inhaled gas used to extinguish fires and were taken to Royal Alexandra Hospital in Paisley.

None of them were harmed and an investigation is under way into how the accident happened.

A Royal Navy spokesman said: "This morning there was an incident on a surface ship.

"Royal Navy personnel were doing a routine fire exercise on board which triggered the fire suppression system on the ship, resulting in them inhaling nitrogen gas.

"Six personnel were taken to hospital as a precaution and everyone else was declared fit. All six have been given the all-clear."