Arrests over St Petersburg subway bombing

Six members of terrorist cells have been arrested in connection with last week's deadly bombing on the subway in St Petersburg, Russia's intelligence chief says.

Last week's suicide bombing in Russia's second-largest city killed 13 passengers and injured dozens.

A Kyrgyz-born Russian national has been identified as the bomber.

Alexander Bortnikov, chief of the FSB, the main successor to the KGB intelligence agency, said in comments carried by Russia news agencies on Tuesday that six members of terrorist cells had been detained in St Petersburg and two in Moscow in connection with the attack.

Bortnikov said all of them were from former Soviet Central Asian republics and the police found a large amount of weapons and ammunition at their homes.