Noor Abu Hassira is one of hundreds of thousands of Palestinians staying in Gaza City as Israel presses on with an offensive to take it over.

The advance came hours before US President Donald Trump is set to present the principles for peace and post-war governance in Gaza at the UN in New York.

Israel accuses Hamas of using medical facilities for military purposes, which could cause them to lose their protected status under international law, but the IDF has often provided little evidence to support this.

Israeli forces are showing no signs of relenting on their new ground offensive in Gaza City as world leaders gather in New York for the United Nations General Assembly and more countries prepare to join the surge of nations recognizing a Palestinian state.

More than half of Gaza City's residents have evacuated the area as Israel Defense Forces continue their offensive in what they call a Hamas stronghold.

Hamas-linked social media channels say "three collaborators who were spying for the occupation" were executed.

Israeli bombardment over the past 23 months has killed more than 65,000 people in Gaza, destroyed vast areas of the strip and displaced around 90% of the population.