Djalilov's 'genetic trace' was also found on a bag with the second bomb found at a different station. (Photo: AP)

Moscow: Russia's Investigative Committee on Tuesday named the attacker behind Saint Petersburg metro blast as 22-year-old Akbarjon Djalilov, adding that he had also planted a second bomb that was defused by the authorities.

"The investigation identified the man who set off the bomb in the carriage of the Saint Petersburg metro. It was Akbarjon Djalilov," a statement by the committee said, adding that Djalilov's "genetic trace" was also found on a bag with the second bomb found at a different station.