They were addressing a hastily arranged gathering dubbed the Cairo Peace Summit that included leaders and foreign ministers from Europe, Africa and beyond.
More than 4,100 Palestinians have been killed in Israel's counteroffensive, amid a growing humanitarian crisis in Gaza.
Arab countries have voiced anger at Israel's unprecedented bombardment and siege of Gaza, home to 2.3 million people and one of the most densely populated places on earth.
Shortly before the summit opening, trucks loaded with humanitarian aid began entering the Rafah crossing into Gaza.
Egypt has been trying for days to channel humanitarian relief to Gaza through the crossing, the one access point not controlled by Israel.
Persons:
Mutasem, Abbas, Jordan's Abdullah, Israel's, Jordan's King Abdullah, Mahmoud Abbas, Olaf Scholz, Rishi Sunak, Emmanuel Macron, Abdel Fattah al, Sisi, King Abdullah, Jordan, William Maclean, Tomasz Janowski, Mark Heinrich Our
Organizations:
Hamas, REUTERS, Cairo Peace Summit, European Union, West Bank, British, Israel, Thomson
Locations:
Israel, Palestinian, Gaza City, Jordan's Abdullah CAIRO, Gaza, Cairo, Europe, Africa, United States, Israel's, Gaza ., Egypt's, Sinai, Egypt