An alliance of mostly Muslim-majority countries including Turkey, Egypt and Iran on Saturday demanded full Palestinian membership of the United Nations and greater international pressure on Israel amid the Gaza war.

The D-8 Organization for Economic Cooperation, which also includes Bangladesh, Indonesia, Malaysia, Nigeria and Pakistan, called for an immediate ceasefire in the devastated Palestinian territory, where Israel has been battling Hamas militants for more than eight months.

Foreign ministers from the group meeting in Istanbul called on the United States to lift its veto on full Palestinian UN membership and on all countries to exert diplomatic, political, economic and legal pressure on Israel.

They also urged states to ensure Israel complies with the International Court of Justice's decisions, withdraws from the southern Rafah governorate and guarantees the safe entry of humanitarian aid to Gaza.

Denouncing an "ongoing genocide and grave violations of international law", the group called on states to contribute to and join legal proceedings against Israel at international courts.

The eight countries also demanded an end to arms and ammunition deliveries to Israel and that all measures be taken to protect Palestinian civilians, rejecting any attempted forced displacement.

They advocated a two-state solution based on 1967 borders with east Jerusalem as a Palestinian capital and a guarantee mechanism to protect a future settlement.

The Gaza war was sparked by Hamas's unprecedented October 7 attack on southern Israel which resulted in the deaths of 1,194 people, mostly civilians, according to an AFP tally based on Israeli official figures.