The World Health Organisation says Gaza's biggest hospital is "virtually a cemetery" with bodies piling up inside and out.
A mass grave has been dug at Al Shifa Hospital and a doctor says there are now 200 bodies in total that have been buried in the hospital grounds.
US President Joe Biden says Gaza's hospitals "must be protected", amid allegations from Israel that Hamas is using hospitals to coordinate attacks.
Hamas denies that their fighters hide under hospitals, as do Gazan health officials and hospital directors.
The UN says only one hospital in northern Gaza remains operational as strikes by the Israeli military leave medics fighting to keep patients, including premature babies, alive.
Hector Sharp was born in Wellington but now works for the United Nations Relief and Works Agency for Palestine Refugees.
Sharp spoke to Ingrid Hipkiss.