Four blasts within minutes have rocked the centre of the Ukrainian city of Dnipropetrovsk, injuring at least 27 people, including nine schoolchildren.

Prosecutors are treating it as a terrorist attack.

The first blast occurred at a tramway stop in the city centre, injuring 13 people.

The second injured 11 people near a school, among them nine children, while the third wounded three near a railway station.

A fourth blast was also heard in the city centre but it was unclear whether anybody was injured.

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