Russian missile attacks on residential areas in a coastal town near the Ukrainian port city of Odesa early Friday killed at least 18 people, including two children, authorities reported, a day after Russian forces withdrew from a strategic Black Sea island.

Video of the pre-dawn attack showed the charred remains of buildings in the small town of Serhiivka, located about 50 kilometers (31 miles) southwest of Odesa. Ukrainian news reports said missiles struck a multi-story apartment building and a resort area.

“A terrorist country is killing our people. In response to defeats on the battlefield, they fight civilians,” Andriy Yermak, the chief of staff to Ukrainian President Volodymyr Zelenskyy said.

The deputy head of the Ukrainian presidential office, Kirill Tymoshenko, said 18 people died, including two children. A spokesman for the Odesa regional government, Serhiy Bratchuk, said on the Telegram messaging app that another 30 had been injured.