"While the investigation is still ongoing we cannot say categorically why the Russian jet crashed. But as more information has come to light we have become concerned that the plane may well have been brought down by an explosive device," the office of Prime Minister David Cameron said in a statement.
All flights due to leave the holiday resort for Britain today are affected, to allow UK experts to assess security, the statement said. "In light of this, and as a precautionary measure, we have decided that flights due to leave Sharm for the UK this evening will be delayed," it said.
That will allow time for a team of UK aviation experts, currently traveling to Sharm, to make an assessment of the security arrangements in place at the airport and to identify whether any further action is required, it added.
"We expect this assessment to be completed tonight," she said. A Russian Airbus 321 crashed on Saturday in Egypt's Sinai Peninsula, killing all 224 people on board. Cameron is to chair a meeting of the UK's Cobra emergency committee on the issue later on Wednesday.
The development comes as an Islamic State (ISIS) affiliated group released a new message claiming responsibility for the crash. Syria analysts have shared an audio message on social media which is believed to be a message from Wilayat Sinai, an affiliate of ISIS-based in Sinai.
The message, thought to be the voice of a Abu Osama Al-Masri, confirms the claim of responsibility that was made on Saturday, saying "we downed it so die in your rage".



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