KYIV, Ukraine — A Russian attack using cluster munitions killed three people Thursday in a suburb of Ukraine’s southern city of Kherson, a Ukrainian official said, bringing the number of civilians to die in a day of war to at least six.

       Five people were wounded in what Ukrainian Interior Minister Ihor Klymenko said was heavy afternoon shelling of Kherson’s Chornobayivka suburb. More than 60 residential and infrastructure buildings were damaged in the daylight attack, he said.

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       Cluster munitions — a type of bomb that opens in the air and releases smaller “bomblets” across a wide area — are used by both Russia and Ukraine, which has received them as military aid from the United States. Critics say the weapons litter the ground and harm and kill many more civilians than combatants.