Israel has repeatedly targeted Al-Shifa, the Palestinian territory's largest hospital, and other medical facilities in its war on Gaza, now in its seventh month.

Motassem Salah, head of the emergency department at Al-Shifa, told journalists that "a third mass grave was found inside this hospital."

The Gaza government media office said in a separate statement that at least 49 bodies had been recovered from the site on the premises of Al-Shifa.

AFP footage from Al-Shifa hospital showed at least a dozen bodies wrapped in black plastic body bags.

Standing in front of the ruins of the hospital, which was devastated by a two-week Israeli siege in March, Salah said several of the bodies had decomposed.

Last month, around 30 bodies were reported found buried in two other graves in the hospital courtyard.

After the Israeli assault in March, the World Health Organisation said Al-Shifa had been reduced to ashes, leaving behind an "empty shell" with mass graves.

Israeli forces have killed hundreds of Palestinians during the deadly hospital raid and detained hundreds more. Gaza's Civil Defence agency reported at least "300 martyrs."

On Wednesday, the media office said health workers continued to uncover bodies from the complex.

So far 520 bodies have been recovered from "seven mass graves" found at three different hospitals across Gaza in recent weeks, the media office said.

Israel's war on Gaza has killed 34,844 Palestinians, mostly women and children, according to the Gaza health ministry.

*This story was edited by Ahram Online