A leading St. Petersburg news portal, Fontanka.ru, said materials used in the explosive device found Thursday matched those used by militants in Syria.
A bomb went off at about 14:40 Moscow time on Monday in a metro train auto when the train was moving from Tekhnologichesky Institut Station to Sennaya Ploshchad Station in St. Petersburg.
The 50-year-old Russian appeared stunned in the spotlight of state television, describing how he had driven the train through to the next station despite smoke from a blast in one of its carriages.
The ministry said that Dzhalilov "has never received a Kyrgyz passport".
There was no immediate claim of responsibility for the Monday afternoon attack, which came while President Vladimir Putin was visiting the city, Russia's second biggest and Putin's hometown.
Djalilov's remains were found at the blast site and traces of his DNA were also discovered on a bag containing a bomb at another metro station that was successfully defused, investigators said.
Russia's health minister has raised the death toll from Monday's blast on the St. Petersburg subway to 14.
Russian investigators said Thursday they have arrested three men who may have been accomplices in the St. Petersburg subway attack Monday that killed 14 people and wounded dozens more, and a Russian news agency reported that the suspected bomber may have trained with the Islamic State in Syria.
Investigator Svetlana Petrenko said the driver of the train saved lives by continuing on to the next stop, reducing the danger to passengers who would have had to walk along electrified tracks.
"I had no time to think about fear at that moment", he said.
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Democracy and democratic elections are attainable by reference to the people's vote and respect to the law, he told reporters. But some prominent conservatives, including parliament speaker Ali Larijani, have thrown their support behind Rouhani.
Authorities have not specified whether the attack was a suicide bombing or whether the bomber got away.
Oleg Alexeyev, 53, who trains sniffer dogs for the police, went to the Technological Institute station Tuesday morning to lay flowers in the memory of those who died nearby.
(AP Photo/Dmitri Lovetsky). CLARIFIES THE EVENTS ABOUT THE DEATH OF THE CHILD A photograph of Irina Medyantseva, one of the victims of the subway explosion, is placed at a makeshift memorial at the Tekhnologichesky Institute subway station in St. Peter.
Four stations on the subway were closed again Tuesday due to a bomb threat, but later reopened.
The 22-year-old Jalilov, who worked at a garage in St Petersburg, was born in the Central Asian country of Kyrgyzstan, but obtained Russian nationality in 2011.
"We see that, unfortunately, the situation is not improving", he said.
A spokesman for Russian president Vladimir Putin would not comment on the reports, saying it was up to law enforcement agencies to provide details about the investigation.
"Or the person thought they were being followed, so detonated the device as soon as they thought they could and still kill as many people as possible".
The attack follows a long string of bombings of Russian planes, trains and transportation facilities.
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