Two female suicide bombers wearing belts packed with explosives blew themselves up on the Moscow subway just before eight o'clock this morning ? a time when the city is busiest with commuters. Chechen rebels are believed to be responsible for the attack, which has left at least 37 people dead.
The first explosion took place on a train pulling into the Lubyanka station and the second was at the Park Kultury station. For more we're joined by The New York Times Moscow bureau chief, Clifford Levy, and the BBC's World Service Russia editor, Olexiy Solohubenko.