A car explosion in Russia's second city, St Petersburg, has killed three people including a small child.

Andrei Alybayev, spokesman for the local branch of the emergencies ministry, said: "A car exploded near the metro station Udelnaya at 8.55am (5.55 UK time).

"Three people were killed, including a three-year-old child."

He added that the explosion could have been caused by a "grenade", without giving any further details.

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A fourth person has been seriously injured by the bombing.

The station was not closed after the explosion, Mr Alyabev said.

Russia's Prime Minister Vladimir Putin is currently in the region around St Petersburg to inspect a new border post with neighbouring Finland.

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