At least 10 people have been killed and many more injured after a blast rocked a metro station in St Petersburg, Russian authorities have said.
The metro service said an explosive device was detonated on a train at the Sennaya Ploshchad station in Russia’s second city. The entire metro network was shut down in the aftermath of the blast.
Photographs from the scene showed a metro train in the station with one set of doors blown out, and a number of people on the ground with injuries.
Andrei Kibitov, a spokesman for the St Petersburg governor, told Russian television 10 people had been killed and 50 injured.
The Interfax news agency quoted law enforcement sources claiming the blast was caused by explosive material placed in a carriage.
A live stream on the Russian website Life News said there had been either one or two explosions at about 2.30pm local time. The video showed hundreds of people waiting outside the station entrance at street level, along with fire engines and police vehicles.
The Moscow metro said it was taking unspecified additional security measures in case of an attack there.
Vladimir Putin, who is in St Petersburg for a meeting with the president of Belarus, Alexander Lukashenko, said the cause of the blasts was not yet known and efforts were under way to find out.
The Russian president said it was too early to say what caused the blast but said it could be “criminal or terrorist”. Putin said he had already spoken with the director of the FSB security services and other law enforcement agencies.
More details soon...