A preliminary report on the plane crash on 31 October that killed all 224 people on board said investigators had "so far not found anything indicating any illegal intervention or terrorist action".

Contrary to the initial findings of the Egyptian investigation into the plane crash, Russia believes the Metrojet was brought down by a bomb.

Last month, a member of the air accident investigation team in Egypt said investigators were "90% sure" the noise heard on the black box of the airliner seconds before it crashed was caused by a bomb.

The US and Britain have also previously said an explosive device is likely to have brought down the aircraft.

A group affiliated to Islamic State has claimed responsibility for bringing down the plane, but has not provided any evidence to confirm it was behind the attack.

But Egypt's civil aviation ministry on Monday said it had so far found no evidence of a criminal act.

Security at Sharm El Sheikh airport has become a widespread concern since the crash with the UK, Russia and various other countries suspending flights from the Red Sea resort.

UK aviation experts at the time identified serious security flaws at the airport.

Additional levels of baggage screening and searches were implemented on a short-term basis, and the Government has been working with Egyptian authorities on long-term sustainable measures to make the airport safe.