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.

Doctors Without Borders called on Israel to "lift the inhumane and deadly siege" and for all parties to restore the ceasefire.

The New York Times obtained autopsy reports for 14 of the 15 people killed in a March 23 attack on an ambulance and fire truck.