8 arrested in connected with St. Petersburg bombing

People lay flowers at a memorial stone for Leningrad (St. Petersburg) at the Tomb of Unknown Soldier during a rally honoring the victims of St. Petersburg's subway bombing just off Red Square in Moscow, Russia, Thursday, April 6, 2017. A bomb blast tore through a subway train under Russia's second-largest city on Monday, killing 14 people and wounding more than 40. (AP Photo/Alexander Zemlianichenko) (The Associated Press)

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People gather at a symbolic memorial at Technologicheskiy Institute subway station in St.Petersburg, Russia, Friday, April 7, 2017. A bomb blast tore through a subway train under Russia's second-largest city on Monday, killing people and wounding more than 40. (AP Photo/Dmitri Lovetsky) (The Associated Press)

Blast victims lie near a subway train hit by a explosion at the Tekhnologichesky Institut subway station in St. Petersburg, Russia, Monday, April 3, 2017. (AP Photo/DTP&ChP St. Peterburg via AP) (The Associated Press)

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

Last week's suicide bombing on the subway 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 have been detained in St. Petersburg and two in Moscow in connection with the attack. Bortnikov said all of them are from former Soviet Central Asian republics and that the police found a large amount of weapons and ammunition at their homes.