An aviation watchdog has ordered safety checks on Super Puma helicopters after a fatal crash in Norway.

Iain Stuart from Aberdeenshire was among 13 people killed when the EC225 went down near Bergen on Friday.

Air accident investigators believe a technical fault caused the crash, which happened after the helicopter's rotor blades detached in mid-air near the island of Turøy.

The European Aviation Safety Agency (EASA) said current information indicates the blades came off when the main rotor hub detached from the Super Puma's gearbox.

As a result, the safety watchdog has issued an Emergency Airworthiness Directive ordering operators to carry inspections on EC225 rotors and report any problems.

An EASA spokesman said: "The airworthiness directive requires, as a precautionary measure, to perform before next flight certain inspections on the fleet of EC225 helicopters and to report any discrepancy to both EASA and Airbus Helicopters.

"This AD must be considered an interim action - further mandatory action may follow owing to investigation progress."

Most of the wreckage has been taken to Haakonsvern naval base but some parts remain missing.

On Sunday, it emerged helicopter operator CHC had replaced parts on the Super Puma after a warning light earlier in the week.

Norwegian Civil Aviation Authority legal adviser Hege Aalstad said the helicopter had both its gearbox and rotor head replaced in the months before the crash.