Russia has grounded Airbus A321 jets flown by the Kogalymavia airline, Interfax news agency reported on Sunday, after one of its fleet crashed in Egypt's Sinai Peninsula, killing all 224 people on board. The A321, operated by the Russian airline under the brand name Metrojet, was carrying holidaymakers from the Red Sea resort of Sharm el-Sheikh to St Petersburg when it went down soon after daybreak on Saturday. Egyptian and Russian investigators will begin examining within hours the contents of two "black box" recorders recovered from the airliner, which crashed into a mountainous area of central Sinai shortly after losing radar contact near cruising altitude.