Russian Plane Crash: UK Suspects Bomb Was Placed In Hold
The government decided terrorism was likely after receiving intelligence based on intercepted messages between militants in the Sinai peninsula.
Meanwhile, more countries have joined the UK in curbing travel to the Egyptian resort of Sharm El-Sheikh.
France, Belgium and the Netherlands warned their nationals not to travel, and German airlines canceled flights.
UK airlines will start to repatriate tourists on Friday, but with hand luggage only.
Militants linked to Islamic State (IS) have claimed they destroyed the plane. But the cause of the crash is still unclear and Russia – which is carrying out air strikes against ISIS in Syria, has warned against pre-empting the outcome of the official investigation.