The Kremlin believes that any theories about what caused a Russian plane to crash in the Sinai Peninsula killing 224 people are speculation and that only the official investigation can determine what happened, a spokesman said on Thursday.

Dmitry Peskov, a spokesman for President Vladimir Putin, was reacting to an assertion from British Foreign Secretary Philip Hammond who said that there was a significant possibility that Islamic State's Egyptian affiliate had orchestrated a bomb attack on the Russian airliner.

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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," British Prime Minister Cameron had said on Thursday, prompting Moscow’s reaction.

"We have said this before and we will repeat it again: Theories about what happened and the causes of the incident can only be pronounced by the investigation," said Peskov, when asked about Hammond's comments.

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Peskov said Russian planes were continuing to fly to and from Sharm el‐Sheikh Airport in Egypt, despite Ireland and Britain suspending flights. He said he hoped that anyone who had information about what really happened would pass it onto investigators.

Russian Prime Minister Dmitry Medvedev told a government meeting on Thursday he also deemed it too early to draw any conclusions about the causes of the crash. He ordered officials to start talks with foreign aviation authorities to see if additional security measures could be taken.