{Russia and Egypt have urged caution over suggestions that a Russian airliner that crashed in Sinai killing 224 passengers may have been bombed.}
Russia said such theories were “speculation”, while Egypt said there was “no evidence” yet to support them.
US and UK officials say intelligence suggests the plane may have been bombed. The UK has suspended flights to and from Sharm el-Sheikh.
Militants linked to Islamic State have claimed they brought the plane down.
The Metrojet Airbus 321, bound for St Petersburg, crashed in Egypt’s Sinai desert just 23 minutes after take-off from Sharm el-Sheikh on Saturday.
Most of those on board the plane were Russian.
“Intercepted communications” have led the US to conclude tentatively that the Russian plane may have been downed by a bomb planted by the IS affiliate Sinai Province, an official told AP.
Kremlin spokesman Dmitry Peskov earlier said any explanations being put forward “seem like unverified information or some sort of speculation”.
Egypt’s Civil Aviation Minister Hossam Kamal said investigators had “as yet no evidence” to confirm a bomb attack.
Egypt is leading the investigation, with the help of Russian and other foreign experts. They will examine the wreckage for traces of explosives, but would not reach their first conclusions for a few months, said Alexander Neradko, head of Russia’s aviation agency.
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“We cannot be certain that the Russian airliner was brought down by a terrorist bomb, but it looks increasingly likely that that was the case,” said UK Prime Minister David Cameron.
He and the Russian President Vladimir Putin have spoken by phone, according to a Kremlin statement.
Mr Putin stressed the importance of using data from “the ongoing official investigation,” to assess the causes of the incident, the statement said.
Egyptian President Abdel Fattah al-Sisi, who is on an official visit to the UK, is meeting Mr Cameron in London.
“We do not want to rush into conclusions,” he earlier told the BBC. “We all share the same concerns. We want to know the reasons behind it.
“The investigation will be disclosed with all transparency, we have nothing to hide.”
Mr Sisi had previously dismissed the IS claim as propaganda.

BBC

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