Security officials in Russia say they have made important breakthroughs in the investigation into the fatal bombing of the Moscow metro. Russian police say video surveillance has revealed the two suspected suicide bombers had accomplices, says an report.

They are searching for two women and a man seen with the suspected bombers at a metro station outside central Moscow on the morning of the attack.
The report also notes that there is new evidence that links the suspects to Chechnya, as a private bus driver has confirmed he drove the suspected bombers and a man from the Chechen capital, Grozny, to Moscow.