Artillery shells hit close to the city centre of the rebel-held city of Donetsk in eastern Ukraine, Reuters news agency reports.
People poured out of their offices onto the stairwell of the city's main administration building after loud explosions nearby triggered an evacuation warning. There were at least two further blasts near the city, the first time artillery shells have hit the area.
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Protesters angry that far-right leader Marine Le Pen is advancing the French presidential runoff are scuffling with police in Paris.
Polling projections show the far-right leader Marine Le Pen and centrist Emmanuel Macron leading in the first-round of the French election.