Sources say they suspect a suicide bombing blast in a Moscow airport killed at least 31 people, and injured 130 so far.

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An explosion ripped through the arrivals hall at Moscow's busiest airport on Monday, killing 31 people and wounding about 130, Health Ministry officials said.

The Interfax news agency, citing an unnamed source, and state-run RIA Novosti said the blast at Domodedovo airport might have been caused by a suicide bomber.

The Russkaya Sluzhba Novostei radio station cited a traveler, identified as Viktor, as saying he heard the bang while he was waiting for a car outside the airport.

"There was an explosion, a bang. Then I saw a policeman covered in fragments of flesh and all bloody. He was shouting 'I've survived! I've survived!'" he told the radio station.