Steve Witkoff on Friday visited a site run by the US and Israel-backed Gaza Humanitarian Foundation in Rafah in the war-shattered Palestinian territory, where Israel has been fighting the militant group Hamas.
Humanitarian organisations and many foreign governments have been strongly critical of the GHF, which began operations in late May. A global hunger monitor warned this week that famine is unfolding in Gaza.
Hours after Witkoff's visit, Palestinian medics reported Israeli forces shot dead three Palestinians near one of the group's sites in the city on Gaza's southern edge. Reuters could not immediately verify whether it was the same location.
The Israeli military said it was still looking into the incident in which soldiers fired warning shots at what it described as a "gathering of suspects" approaching its troops, hundreds of metres from the aid site.
The UN says more than 1000 people have been killed trying to receive aid in Gaza since the GHF began operating, most of them shot by Israeli forces operating near GHF sites.
The Israeli military has acknowledged that its forces have killed some Palestinians seeking aid and says it has given its troops new orders to improve their response.
The UN has declined to work with the GHF, which it says distributes aid in ways that are inherently dangerous and violate humanitarian neutrality principles, contributing to the hunger crisis across the territory.
The GHF says nobody has been killed at its distribution points, and that it is doing a better job of protecting aid deliveries than the UN
Israel blames Hamas and the UN for the failure of food to get to desperate Palestinians in Gaza and introduced the GHF distribution system, saying it would prevent aid supplies being seized by Hamas. Hamas denies stealing aid.
Indirect negotiations between the sides aimed at securing a 60-day ceasefire and hostage release deal ended last week in deadlock.
Hamas on Friday released a video of Israeli hostage Evyatar David in one of its tunnels appearing skeletally thin. Its allied Islamic Jihad militant group released a video on Thursday of hostage Rom Braslavski, crying and pleading for his release.
Witkoff visited Gaza a day after meeting Israeli Prime Minister Benjamin Netanyahu. Israel is under mounting international pressure over the devastation of Gaza since the start of the war and growing starvation among its 2.2 million inhabitants.
Gaza medics say dozens of people have died of malnutrition in recent days after Israel cut off all supplies to the enclave for nearly three months from March to May.
Israel says it is taking steps to let in more aid, including pausing fighting for part of the day in some areas and announcing protected routes for aid convoys.
On Friday, the Israeli military said 200 trucks of aid were distributed by the UN and other organisations on Thursday, with hundreds more waiting to be picked up from the border crossings inside Gaza.
The UN says it has thousands of trucks still waiting, if Israel would let them in without the stringent security measures that aid groups say have prevented the entry of humanitarian assistance.
Israel began allowing food air drops this week, but UN agencies say these are a poor alternative to letting in more trucks. On Friday, the Israeli military said that 126 food packages were airdropped by six countries, including for the first time France, Spain, and Germany.
The Gaza war began when Hamas killed more than 1200 people and took 251 hostage in an attack on southern Israel on October 7, 2023, according to Israeli figures. Israel's offensive has since killed more than 60,000 Palestinians, according to Gaza health officials.
