In St. Petersburg, Russia, the subway system was hit with a massive explosion. At least 10 people are confirmed dead and there are many more injuries. People on social media are capturing the horror of what just happened.
Here is what we know:
At least 10 people have been killed in explosions at underground stations in St Petersburg, Russian media report.
The Tass and Interfax agencies reported the blasts hit the Sennaya Ploshchad and nearby Institute of Technology 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.
Russian President Vladimir Putin, who is in the city, has been informed, Russian media say. The cause of the explosions is not yet known.
— Dio Perix (@DioPerix) April 3, 2017
— NDTV (@ndtv) April 3, 2017
— IndependentNewspaper (@IndependentNGR) April 3, 2017
This is a breaking news story. We will have more details when they become available.