Explosions at underground stations in St Petersburg, Russia have killed at least 10 people, according to reports.
Russian media has reported the blasts hit the Sennaya Ploschard and nearby Tekhnologichesky Institut stations in the centre of the city.
All other Metro stations in the city have been temporarily shut.
The cause of the explosions is not yet known, although The Telegraph is reporting the possibility of the use of “shrapnel-filled devices”, and has published several images showing blown out metro train doors.
President Vladimir Putin said all causes, including terrorism, were being investigated.
Updates to follow