A photo has been released of a man suspected in the St Petersburg metro bombing.
Kyrgyzstan's State Committee for National Security said in a statement it believed one person it suspected of the bombing was a Kyrgyz-born Russian citizen it identified as Akbarzhon Dzhalilov, or Jalilov.
Interfax news agency said authorities believed the 23-year-old suspect was linked to radical Islamist groups.
Russia's state investigative committee said the bomb may have been detonated by a man whose body parts were found in one of the train carriages. It was not immediately clear if its statement related to the man named by Kyrgyz authorities.
"It has been ascertained that an explosive device could have been detonated by a man, fragments of whose body were found in the third carriage of the train," the committee, which has sweeping powers, said in a statement.
On Tuesday Russia's health minister revised the death toll from the bombing to 14. Forty-nine people are in hospital. And four metro stations were cordoned off on Tuesday morning following a new bomb threat, but have since re-opened.
