Russian President Vladimir Putin visited the scene of St. Petersburg metro bombing, in which at least eleven people were killed and several others injured and laid flowers at Tekhnologichesky Institut metro station.
The president laid a bunch of scarlet roses in memory of those killed in the terror attack on Monday.
"Vladimir Putin arrived at the entrance way to the Tekhnologichesky Institut metro station where he laid flowers in memory of those killed in today's metro blast," Russian state-owned news agency Tass quoted Putin's press secretary Dmitry Peskov as saying.
At least eleven people were killed and several others injured in an explosion inside a metro train at the Sennaya Square station in Russia's St. Petersburg.
According to the National Anti-terrorist Committee, the blast claimed 11 lives and injured forty-five people.
TASS news agency reported that an unidentified device exploded in a train car.
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Meanwhile, investigators in Russia are suspecting two natives of Central Asia, a man and a girl, involvement in the blast.
Earlier, Russian President Vladmir Putin expressed his condolences and indicated that there will be an investigation with respect to the blast.
Putin said he was in contact with the Federal Security Service (FSB) and law enforcement to determine the reason behind the explosion.
Russian Prime Minister Dmitry Medvedev called the St. Petersburg explosion a 'terrorist attack.'
"Those who suffered during the terrorist act in the St. Petersburg metro will be provided with all the necessary assistance. All instructions to the Ministry of Health and the Ministry of Emergency Situations are given. My most sincere condolences to the families and friends of the victims of the explosion. This is a common pain," Medvedev wrote on his Facebook page.
Seven metro stations in the city have been closed following the blast.