At least 10 people have been killed in explosions at underground stations in St Petersburg, Russian media report. News agencies reported the blasts hit the Sennaya Ploschad and nearby Tekhnologichesky Institut stations in the centre of the city.
Images posted on social media showed a carriage in Sennaya station with its doors blown out with casualties nearby.
President Vladimir Putin said all causes, including terrorism, were being investigated.
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