With St. Petersburg residents tense following the deadly subway bombing, the collapse of part of apartment building Thursday triggered fears of a new attack until city authorities explained the cause.
Investigators said Djalilov - believed to be a Russian citizen born in the central Asian nation of Kyrgyzstan - had set off a bomb in a train carriage travelling between two busy Saint Petersburg metro stations on Monday afternoon.
Investigators say that they don't have any information that would link these suspects with the suspected bomber who killed 14 people with a suicide bomb inside a subway auto in St. Petersburg Monday.
No one has so far claimed responsibility for the attack.
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Russian investigators found DNA that identified the suicide bomber as a 22-year-old Kyrgyz Russian citizen, Akbarzhon Dzhalilov.
Jalilov allegedly detonated an explosive on the city's metro between the central Sennaya Square and Tekhnologichesky Institut stations.
Meeting with the heads of security services from a regional alliance that includes most of Russia's Central Asian neighbors, President Vladimir Putin warned that terrorism remained a threat to all in the region.
During the raids, explosives were also found which authorities say are similar to the unexploded bomb found in the city's metro after Monday's suicide bombing.
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"We see that, unfortunately, the situation is not getting better and the clearest confirmation of that is the recent tragic incident in St Petersburg", Putin said.
The statement did not disclose whether Dzhalilov had accomplices or connections to the Islamic State or other terrorist groups.
Earlier, six suspected Islamic State (IS, formerly ISIS/ISIL) and Al-Nusra Front recruiters, who reportedly originate from Central Asian countries, were detained in St. Petersburg.
The bombing killed 13 people and injured dozens more when the explosive detonated on a train auto travelling between two busy Saint Petersburg metro stations. It is now unclear whether the suicide bomber is the same suspect from Kyrgyzstan named Akbarzhon Jalilov.
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The entire St Petersburg subway system was shut down and evacuated, but partial service resumed after about six hours. The intelligence agency said it is cooperating with Russian authorities to help the investigation. He said investigators are looking into whether the explosion was a terror attack.