At least 10 people have been killed in an explosion in a metro station in the Russian city of St. Petersburg.

Russian media reported that the blast took place at the Sennaya Square metro station in the city’s center.

President Vladimir Putin arrived in St. Petersburg on Monday to speak at an annual media forum sponsored by a Kremlin-backed political movement.

Kremlin spokesman Dmitry Peskov said Putin was informed about the explosion.
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