ST. PETERSBURG, Russia — A man from Kyrgyzstan who had a Russian passport was responsible for the deadly subway blast in St. Petersburg, the Russian and Kyrgyz authorities said Tuesday, as the toll from the attack rose to 14 dead and more than 60 wounded.

The Investigative Committee of Russia, the main federal law enforcement agency, identified the bomber as Akbarzhon Dzhalilov, 22. Kyrgyz officials said he was a member of the Uzbek minority in the southern city of Osh who received Russian citizenship in 2011, around the time he moved to St. Petersburg.

Russian forensic experts found his DNA on a bag left at the Vosstaniya Square subway station, the agency’s statement said. A more powerful bomb was discovered there and defused, soon after the explosion on Monday afternoon, on a train that had just departed another station, Sennaya Square.

The DNA evidence, as well as closed-circuit television footage, led investigators to believe that Mr. Dzhalilov had blown himself up and had wanted to bomb the Vosstaniya Square station, the statement said.