Officials from United States (US) and United Kingdom (UK) say intelligence reports suggest that the Russian plane that crashed in Egypt, killing all 224 people on board, may have been brought down by a bomb.
They, however, said that they were yet to reach a formal conclusion.
Britain earlier suspended flights to and from the resort of Sharm El-Sheikh, from where the flight had departed.
Egypt had dismissed claims by militants linked to Islamic State (IS) that they brought down the plane, as Russian experts said that it was too early to say.
Meanwhile, Egyptian officials say the cockpit voice recorder of the Metrojet Airbus 321 was badly damaged in the crash.
However, they managed to extract information from the flight data recorder which is ready to be analysed by investigators.
