The Palestinians have accused Israel of falsifying information to tarnish UNRWA.
Neither the UN nor Israel have detailed how the employees may have been involved in the Hamas attacks.
“The nightmare in Gaza is more than a humanitarian crisis.”
Since the attack by Hamas on civilians in Israel on October 7, Israel has stopped the delivery of water by truck to Gaza.
OCHA said the reported fatality toll was “over threefold the cumulative number of Israelis killed” since it began recording casualties in 2005.
UN Day on October 24 marks the anniversary of the entry into force in 1945 of the UN Charter – the day the organisation officially came into being.
She added that UNRWA has not been able to bring any supplies into Gaza for the past ten days.
The UN chief said the number of deaths and those injured was expected to rise as the attacks were ongoing and many remained unaccounted for.
Established in 1949, UNRWA is mandated to provide humanitarian aid to Palestinian refugees.
