A spokesman for the GKNB security service identified the suspect as Akbarzhon Jalilov, born in the city of Osh in 1995. He provided no other details.
Kyrgyzstan, a predominantly Muslim Central Asian nation of six million, is Russia’s close political ally and hosts a Russian military airbase.
Monday’s blast on board a metro train in St Petersburg killed 11 people and wounded 45.
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Interfax, quoting security sources reported that the suspect had links with radical Islamist groups banned in Russia,
The source added that remains found at the scene of the blast suggested that a suicide bomber was responsible but that final conclusions would be made after DNA tests had been conducted.