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Russia's Prime Minister Dmitry Medvedev admitted Monday that a plane crash in Egypt's Sinai peninsula that killed 224 people was possibly a terrorist attack.

"The possibility of an act of terror is of course there as the reason for what happened," he said in an interview with state-owned newspaper, Rossiyskaya Gazeta, parts of which were published Monday evening.

Britain and the United States, as well as international investigators, suspect a bomb exploded on board of the A321 plane chartered by a Russian tourism firm, but Egyptian officials insist there is no evidence yet of an attack on the plane.

Russia has also refrained from blaming the 31 October crash, which killed everyone on board, on terrorists, however President Vladimir Putin on Friday ordered a ban on all Egypt flights for the time being.

The Islamic State group's (IS) branch in the Sinai claimed responsibility after the crash and said it downed the plane in retaliation for Russian air strikes in Syria, but it has not said how.

Medvedev said about 80,000 Russians were vacationing in Egypt at the time when Putin ordered the halt, as Red Sea resorts are extremely popular among Russians during winter.

"This security measure is necessary until the reason for the A321 crash is known," Medvedev said at a government meeting on Monday.

Since Friday, about 25,000 Russian citizens have been returned from Sharm al-Sheikh, Hurghada and Cairo via special flights, with their luggage flown in separately, said Russian deputy Prime Minister Arkady Dvorkovich.

Russia will need two more weeks to bring the remaining tourists back home, Dvorkovich told Medvedev at the meeting.