The terror attack killed 14 passengers and the man who set off the explosive device, while 102 people were injured.
A Turkish security official says the suicide bomber accused of the deadly attack on the subway in the Russian city of St. Petersburg was deported from Turkey in 2016.
Azimov Abror Akhralovich, 27, a native of the Central Asian region, was detained near Moscow and brought to the Russian Investigative Committee, the service said in a statement.
At the time of his arrest, Azimov was reportedly carrying a pistol and a parcel containing two smartphones.
Craig Shakespeare satisfied with point despite surrendering two-goal lead
Leicester City: Schmeichel 7, Simpson 5, Benalouane 6, Huth 8, Fuchs 6, Mahrez 5, Ndidi 6, King 5, Albrighton 6, Ulloa 5, Vardy 6. Leicester have won three successive matches against Crystal Palace, their best run in all competitive meetings since 1925.
However, there was no evidence that they were in any way linked to the suicide attack in St Petersburg. Kyrgyz authorities said he is a Russian national born in the nation of Kyrygrzstan, the former Soviet Republic in central Asia. At least eight others have been arrested in connection with the bombing.
In 2010, two female suicide bombers linked to the Chechen insurgency blew themselves up at two Moscow metro stations, killing 40.
Russia's Federal Security Service has detained a person who could have been involved in the explosion in the St. Petersburg Metro, as part of the criminal investigation launched by the Investigative Committee, the center said in a statement, RT reports.