Gaza health officials say an Israeli strike on a field hospital killed a medic two days after another attack disabled the enclave's last functioning critical care facility.

A spokesman for a hospital in Gaza says an Israeli airstrike hit the northern gate of the Kuwaiti Field Hospital.

Gaza has become a "mass grave" for Palestinians and those trying to help them, medical charity MSF said on Wednesday, as medics said the Israeli military killed at least 13 in the north of the enclave and continued to demolish homes in Rafah in the south.