Explosion in St Petersburg metro station 'kills 10 people and injures 50'

An explosion on the St Petersburg metro has left 10 people dead and 47 injured, according to Russia’s health minister, Veronika Skvortsova.

There was a single blast in a train carriage between Sennaya Ploshchad and Tekhnologichesky Institut stations, according to the head of Russia’s National Anti-Terrorist Committee.

Another device was discovered and made safe before it could be detonated.

Footage showed injured people lying bleeding on a platform and some being treated by emergency services. Others ran away from the platform amid clouds of smoke.

Russian President Vladimir Putin has said it is not clear what the cause of the incident was.

An injured person walks outside Sennaya Ploshchad metro station following explosions in two train carriages. (Reuters)