Earlier local media reports suggest the blast may have hit the international airport arrival hall.
source: bbcuk
Moscow Domodedovo Airport (Russian: ?????????? ???????? ?????????? Moskovsky Aeroport Domoded?vo) (IATA: DME, ICAO: UUDD) is an international airport located in Domodedovsky District, Moscow Oblast, Russia, 42 kilometers (26 miles) south-southeast from the center of Moscow .

Moscow Domodedovo Airport to operate additional passenger terminal located in downtown Moscow, in the building Paveletsky Railway Station.

Additional information about travel to the airport Domodedo