Russian missiles have hit a dam near the southern Ukrainian city of Kryvyi Rih, officials say.
Residents of some areas were told to evacuate, city chief Oleksandr Vilkul said but added that the situation was under control.
Ukraine has said the strike is Russia’s revenge for its recent counterattack.
President Volodymyr Zelensky – who was born in the city – described Russia as a “terrorist state” after the attack on the Karachunivske reservoir.
“You are weaklings fighting civilians,” Mr. Zelensky said in his Wednesday night speech. “Villains who, after escaping the battlefield, try to do evil somewhere far away.”
This was a clear reference to Ukraine’s recent military successes in a rapid counter-offensive in the northeastern Kharkiv region.
It saw the Ukrainian army recapture parts of the occupied territory, forcing the Russian troops to retreat.
In his speech, Mr. Zelensky stated that the tank “has no military value”. Vilkul said two explosions were carried out overnight to increase the flow of water from the dam to the Inhulets River.
The water supply was affected by the attack on the city, which had a population of over 600,000 before the war. The water broke through the dam and flooded the river banks, inundating some homes, officials said.
On Thursday morning, Mr. Vilkul said the water level in the Inhulets River had now “fallen significantly”. He said there were no injuries.
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Moscow has not publicly commented on the reported rocket attacks.
The Russian military earlier admitted hitting power generation targets last weekend, causing widespread blackouts that affected millions in eastern Ukraine. On Wednesday, Zelensky traveled to the recently recaptured town of Izyum, a key logistics hub in the Kharkiv region.
He thanked the troops who took part in the counter-offensive and promised that the Ukrainian flag would return to every town and village in the country.
The pace of Ukraine’s advance appears to have taken Russian forces by surprise, with reports that some Moscow forces have taken off their uniforms to mingle with civilians.
Russia admitted its forces had left some towns in the Kharkiv region – but refused to call it a retreat, insisting instead that its forces regroup. This claim has been widely ridiculed in the West and even in Russia itself. As Kiev troops move to previously occupied territories, allegations of Russian war crimes begin to emerge
