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TOPSHOT - CORRECTION - Russian President Vladimir Putin places flowers in memory of victims of the blast in the Saint Petersburg metro at Technological Institute station on April 3, 2017. / AFP PHOTO / SPUTNIK / Mikhail KLIMENTYEV        (Photo credit should read MIKHAIL KLIMENTYEV/AFP/Getty Images)
TOPSHOT - CORRECTION - Russian President Vladimir Putin places flowers in memory of victims of the blast in the Saint Petersburg metro at Technological Institute station on April 3, 2017. / AFP PHOTO / SPUTNIK / Mikhail KLIMENTYEV        (Photo credit should read MIKHAIL KLIMENTYEV/AFP/Getty Images)

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    Russia fears ISIS link in Metro attack

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Russia fears ISIS link in Metro attack

In the wake of the attack on a St Petersburg metro station, Russian officials are looking into possible ISIS links. CNN's Matthew Chance reports from Moscow.

Russia fears ISIS link in Metro attack

In the wake of the attack on a St Petersburg metro station, Russian officials are looking into possible ISIS links. CNN's Matthew Chance reports from Moscow.