Russian authorities launched a series of raids across St Petersburg on Wednesday, detaining six people of Central Asian origin believed to have served as recruiters for terrorist groups, including the so-called "Islamic State" (IS) jihadist group.
Investigators said they had no information that would link those detained with the suspected suicide bomber who killed 14 people inside a subway carriage in St Petersburg on Monday.
The arrests were carried out jointly with officers of regional FSB and Ministry of Internal Affairs directorates, as well as special National Guard subdivisions.
According to the Investigative Committee of Russia, since 2015 detainees enmesh other people from Central Asia in the activities of organizations banned in Russia - Djebhat-An-Nusra and the Islamic State.
The Investigative Committee has said the suspects were seeking to involve recruited citizens in the activity of other illegal armed formations, including on the territory of foreign states.
The bombing was the worst terrorist attack in a major Russian city in years. However, suspicions are very likely to fall on the suspect's Islamist background, possibly inspired by IS ideology.
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"Bastrykin instructed to thoroughly investigate all circumstances of the incident and to check all information about the suspect, including to scrutinize his contacts for possible accomplices who are members of the ISIL (former name of the Islamic State) terrorist group, outlawed in Russian Federation", the spokeswoman said.
"We do know that each of our countries, nearly every country, is a potential target of a terrorist attack", he said.
To tackle these threats, the allied security agencies should step up intelligence sharing and mutual ties, Putin said. Shavkat Mirziyoev, the newly-elected president of Uzbekistan who came to Russian Federation on a state visit, told Putin terrorist threats must be met with a swift response.
Jalilov's parents, who say they had not seen their son for a while, were due to fly into St Petersburg on Wednesday and a Reuters witness at Pulkovo airport reported heavy security.
Uzbek President Shavkat Mirziyaev, meeting separately with Putin, said that the bombing "once again signals that we should take very tough measures together" to combat terrorism.