The Ukrainian population was warned on Sunday evening of the danger of radioactive radiation and street fighting in the capital, Kyiv.
But the alerts were false, the military says, adding that an app that warns of airstrikes and other dangers had been hacked.
Kyiv’s own app is said to be working as usual. It has also reportedly said there is no immediate risk of radiation or airstrikes.
Ukrainians are also urged not to click on third-party links or spread unconfirmed rumours.
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