At least 31 people have been killed and at least 130 injured in an apparent suicide bombing on Monday at Moscow's Domodedovo airport, the biggest in Russia.

The explosion occurred near the baggage-claim area.

No conclusions have been drawn about the identity of the perpetrators. One possibility is Islamic separatists from the Caucasus. Last March, two female suicide bombers from that region detonated in Moscow's subway system, killing 40 people.

Below are various videos posted online about the Moscow bombing.

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