How could a bomb have brought down the Russian airliner in Egypt?

A woman lights a candle at Pulkovo international airport for the victims of the Russian MetroJet crash. Photograph: NurPhoto/REX ShutterstockSecurity at the airport was examined by European governments after a 2014 bomb attack on a bus of Korean tourists in Sinai. The authorities subsequently decided it was well protected. The Guardian understands the British government carried out an extra check

[daybeforeyesterday]

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[ohtan]

英政府、件の旅客機が機上の爆弾で墜落した可能性ありとしてシャルムエルシェイク便を全面停止。アイルランドもこれに倣った。米政府も爆弾説を示唆。https://t.co/2lScyQRysc 貸切機故、犯人は乗員乗客ではない可能性が高い