The UN humanitarian chief has urged Israel to open more crossings into Gaza to allow a surge of aid, after Israel warned it would limit supplies into the territory over delays from Hamas in releasing the bodies of deceased hostages.

It acknowledges that "the Middle East cannot endure a persistent cycle of prolonged warfare" and that "the tragedies witnessed over the past two years must serve as an urgent reminder".

As senior Israeli officials accuse Hamas of stalling the implementation of the peace agreement, senior U.S. advisers said that the fragile peace deal that ended the war in Gaza seems to be holding, noting that Hamas is making every effort to return the remaining hostage bodies.

Israel on Wednesday identified more bodies of dead hostages that were handed over by Hamas a day earlier to ease pressure on a fragile ceasefire in its war with Israel.

A large influx of aid, following months of either total blockade or limited access that has contributed to starvation conditions for many Gazans, is a key part of the peace agreement.