Moscow’s Domodedovo airport, the busiest in Russia’s capital, has been rocked by an explosion that has reportedly killed 31 people. / World News

Moscow’s Domodedovo airport, the busiest in Russia’s capital, has been rocked by an explosion that has reportedly killed 31 people. More than 100 people were injured in the blast, which reports suggest may have been the work of a suicide bomber.

Russia’s chief investigator said the explosion was the work of terrorists, and President Dmitry Medvedev said the attackers would be tracked down. The airport is 40km (25 miles) south-east of the city centre.

It is popular with foreign workers and tourists.

Police have stepped up security across Russia’s capital and at other airports, says the BBC’s Steve Rosenberg in Moscow.

Dozens of ambulances

Reports suggested Monday’s blast had hit the baggage reclaim area of the international arrivals hall.

Dozens of ambulances rushed to the scene where emergency services are tending to the wounded.

A RIA Novosti news agency correspondent at the scene reported that a lot of smoke could be seen in the area, and there was a smell of burning.

Last March the Russian capital’s underground system was rocked by two female suicide bombers from Russia’s volatile Dagestan region, who detonated their explosives on the busy metro system during rush hour, killing 40 people and injuring more than 80.