Kyrgyz security authorities named the suspected bomber as Akbarzhon Jalilov, born in Osh in 1995.

#Petersburg The Kyrgyz security authorities named the suspected bomber as Akbarzhon Jalilov, born in Osh in 1995 @rcadyn @realDonaldTrump pic.twitter.com/ZQkRT6RNjZ

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It was a suicide bombing.

BBC reported:

The St Petersburg metro explosion was caused by a bomb possibly detonated by a man whose body parts were found on the train, Russian investigators say.

The blast between two metro stations on Monday killed 14 people and injured 49.

Kyrgyzstan’s security service named the suspect as Akbarzhon Jalilov, who was born in the Kyrgyz city of Osh in 1995 and had obtained Russian citizenship.

His name was later confirmed by Russian investigators, who said he also planted a second bomb that did not explode.

In an earlier statement, the Russian state investigative committee said it had concluded the train bomb may have been detonated by a man whose remains were found in the carriage.