Two schools in the town, about 70 kilometres from the Polish border, were also damaged.
At least eight schools and 10 healthcare facilities, including a maternity hospital, were reportedly damaged in the past week.
Ten Iranian-made Shahed-136/131 drones were shot down over the southern Mykolaiv region alone in the early hours of Tuesday.
During his visit, the UN chief will stop by one of the three Ukrainian ports involved in the framework of the Black Sea Initiative to export wheat grain.
Humanitarians have continued to push to secure food and fertiliser exports from Ukraine and Russia to the wider world.
Head of Ukraine’s railways said “Russian forces are systematically destroying the infrastructure of our railways.”
“The secretary-general strongly urges all parties to enact an urgent and immediate humanitarian ceasefire.”
