At least one Briton is among the 35 people killed in Monday's suicide bomb blast at Moscow's busiest airport.
The Foreign Office confirmed the victim as Gordon Campbell Cousland and said it was urgently investigating reports that a second British national had died.
Russia's Emergencies Ministry said eight foreign citizens, including two Britons, were among those killed.
No claim of responsibility has been made for the blast at Domodedovo Airport, which left another 110 injured.
But Chechen militants behind many other terrorist acts in Russia, including last year's double suicide bombing on the Moscow subway that killed 40, are the main suspects.
The Foreign Office in London said: "Initial indications are that one British national was killed in the explosion at Domodedovo Airport. We are in contact with next of kin and providing consular assistance.
"The consular team is continuing to investigate reports that a second British national was killed but we have no information to confirm this at this time."
Two flights from London Heathrow arrived at the airport shortly before the explosion in the crowded hall at about 4.30pm local time, while one British Airways plane en-route to the Russian capital was turned back towards the UK.
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