The Russian-installed administration in the region on Tuesday said that at least seven people were killed and 70 wounded in an overnight missile attack by Ukrainian forces on the Russian-held town of Nova Kakhovka in Ukraine’s southern Kherson region.

Unverified footage on social media showed smoke and sparks, followed by an immense fireball erupting into the night sky. Reuters reported that pictures showed rubble strewn across streets and scorched buildings.

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Officials from the Russian-installed administration said that Ukraine struck with US supplied HIMARS missiles that destroyed warehouses containing saltpeter, a chemical compound which can be used to make fertiliser or gunpowder, resulting in a large explosion.

According to Ukrainian officials, their forces had destroyed an ammunition depot in Nova Kakhovka. Serhiy Bratchuk, Odesa administration spokesperson, wrote on his Telegram channel that Nova Kakhovka was now “minus” its ammunition warehouse.

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“There are already seven dead for sure,” TASS quoted Vladimir Leontyev, head of the Russia-installed Kakhovka District military-civilian administration.

“There are still many people under the rubble. The injured are being taken to the hospital, but many people are blocked in their apartments and houses,” Leontyev added.

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RIA cited Kirill Stremousov, the deputy head of the Russian-controlled administration in Kherson and said that the city’s hydroelectric power plant was not damaged.

Ukraine has said it expects a fresh assault by Russian ground forces, following widespread shelling which killed more than 30 people.

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Since Russia sent troops into Ukraine on Feb. 24 in the biggest ground invasion in Europe since World War Two, thousands have been killed, millions displaced and whole swathes of some Ukrainian cities turned into wastelands.

The conflict in Ukraine began in 2014, after a pro-Russian president was toppled in Ukraine’s Maidan Revolution and Russia annexed Crimea, fighting was triggered between Russian-backed forces and Ukraine’s soldiers in eastern Ukraine.