The humanitarian organisation said the decision was necessitated by intensifying military operations in Gaza City.
The victims were reported to include a pregnant woman.
Israel is “wrong” to approve plans to occupy Gaza City, British Prime Minister Keir Starmer has said, and urged it to reconsider the new offensive.
Stephanie Tremblay, a spokesperson for the secretary-general, noted that the church was both a place of worship and a sanctuary for civilians.
Israel’s subsequent campaign in Gaza has resulted in the deaths of more than 50,983 people, according to the Hamas-run health authority.
WAFA reported that six people were killed in an Israeli attack on a building in the city.
Mao Ning, China’s foreign ministry spokesperson, reacted to reports of Israeli forces opening fire on a crowd of Palestinians waiting for aid in Gaza City.
The Palestinians have accused Israel of falsifying information to tarnish UNRWA.
According to UN estimates, 46,000 homes have been destroyed and more than 234,000 damaged. This corresponds to a total of 60 per cent of the housing stock.
Seven fuel trucks, including four loaded with cooking gas, passed through the crossing on Saturday, an Egyptian official said.
