Ukraine’s capital region was struck by Iranian-made kamikaze drones early Thursday morning, sending rescue workers rushing to the scene as residents awoke to air raid sirens for the fourth morning in a row following Russia’s massive, deadly assault across the country on Monday.Kyiv regional governor Oleksiy Kuleba said the strike occurred in the area around the capital city.

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It was not yet clear if there were any casualties.In the southern city of Mykolaiv, overnight shelling destroyed a five-story apartment building as fighting continued along Ukraine’s southern front.Mykolaiv Mayor Oleksandr Sienkovych said the building’s top two floors were completely destroyed in a single strike and the rest of the building was left in rubble.

It was not immediately clear if there were any casualties.