United Nations Secretary General, António Guterres, warns fighting could “lead to disaster” at Europe’s largest nuclear plant.
The plant was seized by Russia in early March.
Ukraine and Russia are blaming each other for the attack at the Zaporizhzhia nuclear power plant.
More shelling has been reported at the location.
On Thursday each side said there were 10 hits on the plant’s administrative office and fire station.
On Wednesday, foreign ministers from the G7 group of industrialised nations said Russia must immediately hand back control of the plant to Kyiv.
Last week the facility and its surrounding area in central-eastern Ukraine saw shelling last week.