Several killed, dozens injured, in bomb blast on St Petersburg metro station
At least 11 people have been killed in an explosion at a St Petersburg subway station.
Another 50 people are believed to be injured in the blast.
A homemade device filled with shrapnel detonated inside a train between two central metro hubs at about 2.40pm on Monday.
Russian authorities are treating the incident as a suspected terror attack.
Police are hunting two suspects.