US President Donald Trump has presented a plan to end the Gaza war in a meeting with Arab and Muslim leaders this week, his envoy said Wednesday, as Gaza's civil defence agency reported dozens killed in Israeli attacks.

US envoy Steve Witkoff, who has been involved in months of mediation efforts seeking an end to the nearly two-year war, said Trump had detailed a "21-point plan for peace in the Mideast and Gaza" in Tuesday's meeting with a group of leaders from Arab and Muslim nations.

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