Chechen separatists have denied involvement in this morning's bomb attack on a commuter train in Moscow that killed at least 45 people and left more than 120 injured.
Russian President Vladimir Putin had earlier accused the Chechen leader, Aslan Maskhadov, of being behind the atrocity. He said 'any contact' with the militants only leads to more strikes on civilian targets.
However, a spokesman for Mr Maskhadov denied he was involved in the explosion.
The blast happened at the height of rush hour in the second carriage of the train as it entered a tunnel from Paveletskaya station. Almost 700 people were evacuated from the underground in the aftermath of the blast. Many were rushed to hospital with broken bones and burns.
Underground trains in Moscow are always crowded, especially in winter, with some trains carrying up to 1,000 people.
Russian officials said security had been tightened all over the capital city.
