Intelligence reports have suggested that the Russian plane that crashed in Egypt killing all 224 people on board may have been brought down by a bomb, United States and United Kingdom officials say.
But they say they have 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, the BBC reports.
Egypt has dismissed claims by militants linked to Islamic State (IS) that they brought down the plane.
Separately on Wednesday, Egyptian officials said the cockpit voice recorder of the Metrojet Airbus 321 was badly damaged in the crash.
The plane, bound for St Petersburg, crashed in Egypt’s Sinai desert just 23 minutes after take-off from Sharm el-Sheikh on Saturday.
Most of those on board the plane, which was operated by Russian airline Kogalymavia, were Russian.
