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BBC News - Moscow Metro hit by deadly suicide bombings
CNN bottom line says Chechen rebels claim responsibility.At least 37 people have been killed after two female suicide bombers blew themselves up on Moscow Metro trains in the morning rush hour, officials say.
The first blast occurred in the central Lubyanka station at 0756 (0356 GMT). Police said the dead included 14 people inside a train and 11 on the platform.
The second explosion came about 40 minutes later at the Park Kultury station, where 12 people were killed.
No-one has yet said they carried out the worst attack in Moscow since 2004.
But the BBC's Richard Galpin in the Russian capital says past suicide bombings there have been blamed on Islamist rebels fighting for independence in the troubled North Caucasus region of Chechnya.
Moscow's metro is one of the busiest subways in the world, carrying some 5.5m passengers a day.
Emergency services ministry spokeswoman Irina Andrianova said the first explosion tore through the second carriage of a train as it stood at Lubyanka.
The second blast at Park Kultury, which is also on the Sokolnicheskaya line, came at 0838 (0438 GMT). It struck at the back of the train as people were getting on board.