It's reported an explosion was heard on the black box recorder of the Russian passenger plane which crashed in Egypt a week ago.
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Meanwhile, US officials say they've intercepted messages between Islamic State militants boasting about bringing down the jet with 224 people on board.
Thousands of holidaymakers remain stranded in Sharm el-Sheikh.
Sky's Middle East Correspondent Sherine Tadros says security issues at the airport are slowing up departures
