The UN human rights office has said it had recorded at least 798 killings within the past six weeks at aid points in Gaza run by the US- and Israeli-backed Gaza Humanitarian Foundation and near convoys run by other relief groups.
The GHF uses private US security and logistics companies to get supplies into Gaza, largely bypassing a UN-led system.
After the deaths of hundreds of Palestinian civilians trying to reach the GHF's aid hubs in zones where Israeli forces operate, the United Nations has called its aid model "inherently unsafe" and a violation of humanitarian impartiality standards.
"(From 27 May) up until the seventh of July, we've recorded 798 killings, including 615 in the vicinity of the Gaza Humanitarian Foundation sites, and 183 presumably on the route of aid convoys," UN rights office (OHCHR) spokesperson Ravina Shamdasani told a regular media briefing in Geneva.
The GHF, which began distributing food packages in Gaza at the end of May after Israel lifted an 11-week-old aid blockade, claimed the UN figures were "false and misleading".
It has denied that deadly incidents have occurred at its sites.
The OHCHR said it bases its figures on a range of sources such as information from hospitals in Gaza, cemeteries, families, Palestinian health authorities, NGOs and its partners on the ground.
Most of the injuries to Palestinians in the vicinity of aid distribution hubs recorded by OHCHR since 27 May were gunshot wounds, Ms Shamdasani said.
"We've raised concerns about atrocity crimes having been committed and the risk of further atrocity crimes being committed where people are lining up for essential supplies such as food," she said.
The GHF said it had delivered more than 70 million meals to hungry Gaza Palestinians in five weeks, and that other humanitarian groups had "nearly all of their aid looted" by Hamas or criminal gangs.
The UN Office for the Coordination of Humanitarian Affairs (OCHA) has previously cited instances of violent pillaging of aid, while the UN World Food Programme said last week that most trucks carrying food assistance into Gaza had been intercepted by "hungry civilian communities".
There is an acute shortage of food and other basic supplies 21 months into Israel's bombardment of Gaza during which much of the enclave has been reduced to rubble and most of its 2.3 million inhabitants displaced.
Eighteen killed in continued Israeli attacks - civil defence
The updated UN death toll figures come as Gaza's civil defence agency said Israeli forces killed 18 people today, including ten who were waiting for aid in the south of the war-ravaged territory.
Gaza civil defence official Mohammed al-Mughayyir said that ten people were shot by Israeli forces while waiting for supplies in the Al-Shakoush area northwest of Rafah, where there are regular reports of deadly fire on aid seekers.
The civil defence reported six more people killed in four separate Israeli air strikes in the area of Khan Yunis, in the south of the territory.
Two drone strikes around Gaza City in the north killed two more people, civil defence spokesman Mahmud Bassal told AFP.
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MSF warns acute malnutrition soaring in Gaza
Meanwhile, Doctors Without Borders warned that its teams on the ground in Gaza were witnessing surging levels of acute malnutrition in the territory.
The medical charity, known by its French acronym MSF, said levels of acute malnutrition had reached an "all-time high" at two of its facilities in Gaza.
"MSF teams are witnessing a sharp and unprecedented rise in acute malnutrition among people in Gaza," the organisation said in a statement.
"In Al-Mawasi clinic, southern Gaza, and the MSF Gaza Clinic in the north, we are seeing the highest number of malnutrition cases ever recorded by our teams in the Strip."
MSF said it now had more than 700 pregnant and breastfeeding women and nearly 500 children with severe and moderate malnutrition currently enrolled in ambulatory therapeutic feeding centres in both clinics.
"This is the first time we have witnessed such a severe scale of malnutrition cases in Gaza," Mohammed Abu Mughaisib, MSF's deputy medical coordinator in Gaza, said in the statement.
"The starvation of people in Gaza is intentional," he said, insisting that "it can end tomorrow if the Israeli authorities allow food in at scale".
'Absolute panic'
Meanwhile, UNICEF Communications Specialist for Children in Gaza said there were "absolute panic" yesterday after nine children were killed in an Israeli attack outside a health clinic in central Gaza.
Speaking to RTÉ's Morning Ireland, Rosalia Bollen said mothers and children had gathered at the site, which had not yet opened, to receive therapeutic nutrition products for malnourished children.
She said the organisation distributing the aid was one UNICEF worked closely with and a UNICEF team was deployed to the scene in the aftermath of the strike.
"My colleagues went to the hospital, they interviewed several children and mothers," she said.
"There was a mother of two boys, she lost her one-year-old and her 10-year-old is in the ICU.
"It was a very chaotic scene, there was absolute panic.
"Hospitals in Gaza are overwhelmed with a constant inflow of very severely injured people day in day out.
"These aren't people with a couple of scratches or maybe light concussions, we're talking about people who've lost limbs, who have shrapnel lodged in their bodies with very severe injuries that may be life changing."
Ms Bollen said that in the first seven days of July, at least 100 children had been reported killed.
She said what happened yesterday was "not a unique case" and is the "daily reality" for families in Gaza.
She said families have been deprived of the basics that they need to survive, which has led to diseases, malnutrition and preventable deaths.
"There's just not enough of everything. There's not enough food, there's not enough medicine," she said.
"There's no hygiene products, sanitary pads, nappies. It's all very scarce, and this is engineered scarcity.
"We hope that we will be seeing a major change because what families in Gaza need is the mass influx of supplies today."
Ms Bollen said UNICEF has continued to operate throughout the war and will continue to remain present along with other organisations.
