The six detained were accused of recruiting "mostly immigrants from the republics of Central Asia to commit crimes of a terrorist nature and involvement in the activities of terrorist organizations banned in Russian Federation", including the so-called Islamic State, the statement said.
Militants from IS - which includes foreign fighters from ex-Soviet central Asia and the Caucasus region - have repeatedly threatened an attack on Russian soil in revenge for Moscow's military backing of Syrian leader Bashar al-Assad.
The impoverished, predominantly Muslim countries in Central Asia are seen as fertile ground for Islamic extremists.
Putin met Wednesday with heads of the security services from the Commonwealth of Independent States, a grouping of most former Soviet republics. "The recent tragic events in St. Petersburg are the best confirmation of this", Putin said at the meeting in Moscow.
Police in the city are on high alert following Monday's explosion that killed the attacker and 13 other people and wounded some 55.
The three people who have been detained are all suspected to have links to the suicide bomber thought to be behind this week's subway attack.
Expressing grief on loss caused by the blast, Vice President of India M. Hamid Ansari, in a message, he said that terrorism was a threat to all pluralist and open societies and we needed to act together for dealing with this menace.
North Korea won't talk to China
I dread waking up one morning to find out that Seoul, as North Korea repeatedly threatens , is "a sea of flames". Yet, today, North Korea appeared to send a new, more explicit message - that China is not negotiating for them.
The investigators have searched Dzhalilov's home and found objects similar to those used in the subway bomb, it said.
"Criminalists found his DNA on a bag with a bomb left at the Ploshchad Vosstaniya metro station", said investigators in a statement.
Parts of the bomber's body were found in the wreckage of the metro carriage after the attack, which occurred between Sennaya Square and Technology Institute stations, the Russian authorities said.
"President Trump offered the full support of the United States Government in responding to the attack and bringing those responsible to justice", the White House said in a statement about the phone call. Jalilov had lived in Russia for several years and was a Russian citizen.
Earlier, the Kyrgyz agency 24.kg clarified that parents were taken for questioning late in the evening on April 3, that is, on the day of the terrorist attack in the St. Petersburg subway.
But there had been no attacks against a major city since blasts in the southern city of Volgograd in December 2013, weeks ahead of the Sochi Winter Games.
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