The National Anti-Terrorism Committee, city police, and the Russian Federal Security Service are investigating the exact location of the explosions, although there is a report that it may have been one blast between the Metro stations at Sennaya Ploshchad and the Institute of Technology, affecting both stations.
Earlier Kremlin spokesman Dmitry Peskov said Putin is informed about the blast.
TASS said it has no official confirmation of this information yet.
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It said an unidentified explosive device went off on a train travelling between two stations. Authorities are investing the cause of the St. Petersburg blasts, but they haven't yet ruled out terrorism.
Interfax says authorities are also looking for another person suspected of leaving a second bomb at a subway station. Frantic commuters shouted for others to call an ambulance.
Nataliya Maksimova, who was running late for a dentist appointment, entered the subway near the explosion site shortly after the blast.
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I still enjoy training, the buzz is still there and I just want to try to play as long as I can". 'I do a lot of cryotherapy. Defoe was withdrawn with 30 minutes remaining as England looked to put the game to bed against spirited Lithuania.
Russian transport facilities have been the target of previous terror attacks. Chechnya is also the region of Russian Federation from which the Tsarnaev brothers, who perpetrated the 2013 bombing of the Boston Marathon, originated from and there were reports that elder brother Tamerlan visited the region and met with terror groups during his visit to Russian Federation in the years before the nomination.
Putin was expected to hold talks with the Belarusian president later in the day.
- January 2011: Suicide bomber blows himself up at Domodedovo Airport, Moscow's busiest, killing 35 and injuring 180 people. Since Putin sent forces into Syria in 2015, Islamic State has threatened to strike at Russia, claiming responsibility of the downing of a plane carrying Russian tourists from Egypt to St. Petersburg, which left 224 dead. Moscow's subway had also been hit twice before in February 2004 and September 2004 in bombings that resulted in the deaths of more than 40 people between the two incidents.
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Wilson, who was on the bench getting valuable rest for the beginning of the run, scored the next four points to cap the run. Dominique Dillingham added a jumper, and then back-to-back turnovers led to Bulldog baskets as they closed to within 45-40.