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.