Russia said on Friday that Ukrainian forces had killed at least four people and wounded 13 more in a missile attack on civilians evacuating from the Russian-controlled city of Kherson.
A Ukrainian official acknowledged an attack, but said it occurred after a civilian curfew.
Russian-installed authorities in the southern Ukrainian region which Moscow proclaimed as annexed last month are evacuating around 50,000-60,000 people across the Dnipro River ahead of an expected Ukrainian counteroffensive.