A 29-year-old police officer was killed in an Israeli air strike in the Gaza Strip, according to Ashraf al-Kidra, Gaza's health ministry spokesman.
However there was a conflicting report from Israel's Channel 2 TV claiming the air strike targeted an Islamic militant involved in a recent rocket attack on the southern Israeli town of Eilat.
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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.