Two terrorists were involved in a suicide bomb attack at Moscow's Domodedovo airport that killed 35 and injured up to 180 on Monday, a law enforcement source said.

Both died in the blast that ripped through the international arrivals zone in the afternoon, as friends and taxi drivers were meeting passengers.

"The blast occurred when a suspected female terrorist opened a bag. She was accompanied by a man whose head was ripped off by the explosion," the source told RIA Novosti.

"The terrorists may have wanted to leave the explosive device in the hall but the bomb was detonated inadvertently or by a remote control device," he said.

The terrorists may have been driven to the airport by an accomplice, he added.