The entire metro system in St Petersburg has been shut down after a bomb exploded, killing 10 people and injuring 40 others.
At least 10 people are dead and 40 injured after an explosion on a train in St Petersburg's Metro.
An injured man outside the Technological Institute metro station in St Petersburg
The explosion tore through a train as it was traveling between two stations in Russia's second-biggest city.
Another bomb found at another station has been defused.
Russia's prime minister has confirmed the deadly attack was a terrorist attack, as has the country's Prosecutor General.
The entire Metro system which carries 2.3 million people every day has been closed down.
President Vladamir Putin has declared three days of mourning.
Our Moscow correspondent Daria Bondarchuck has the latest.
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