Iran has said Israeli accusations that it was behind the suicide bomb attack on an airport bus in Bulgaria are "unfounded."
The Iranian Embassy in Sofia issued the denial.
Eight people, including the bomber, were killed in yesterday's blast on a bus carrying Israeli tourists in Burgas Airport.
The attack drew a promise by Israeli Prime Minister Benjamin Netanyahu to "react powerfully" to what he called "Iranian terror."
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The shadow chancellor appeared to differ from his leader, who had been initially reluctant to blame the Kremlin for the ex-spy attack.
The Foreign Secretary said the Kremlin's tit-for-tat expulsion of 23 British diplomats would only impact Vladimir Putin's compatriots.
Sunday will be bitterly cold with snow for most.