At least 10 people have died after a blast on the underground system in St Petersburg, it has been reported.
Interfax and RIA news agencies said two blasts have been reported on the Russian city’s Metro.
Three stations have been closed, according to local media outlet Fontanka.
The Tass news agency and Reuters said that 10 have been killed.
Interfax also said about 10 had died, with about 20 injured.
At least one of the devices was filled with shrapnel, according to an Interfax source.
A Reuters witness said they saw eight ambulances near the Sennaya Ploshchad station and footage broadcast on local TV showed activity by the authorities outside the station entrance.
The St Petersburg underground railway said in a statement: “An evacuation from the stations is ongoing, there are people injured.
“An unidentified object supposedly blew up in a (train) carriage.”