June 23 (UPI) -- At least 13 people were killed and 57 injured in Ukraine, half of them in Kyiv, after Russian forces attacked the capital and other targets in the eastern half of the country with hundreds of drones and ballistic and cruise missiles, officials said Monday.

Kyiv Mayor Vitali Klitschko said in a social media update that six people were killed when a missile struck and badly damaged a building in the central Shevchenkivskyi district, but that the rescue operation was still underway and there might be more casualties buried under the rubble.

"A terrible picture in the Shevchenko district. Extensive damage to a five-story building. Rescuers, medics, and municipal services are working at the scene. The blast wave also damaged the apartments of the 25-story residential building opposite. Ten people were rescued from it. Among them, a child and a pregnant woman," said Klitschko.

Another 22 people were injured, 12 of them hospitalized, in attacks on residential and non-residential buildings in five other districts of the capital, he added.

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