The UN has indicated that a large number of those receiving medical attention for wounds after a rush on an aid convoy in Gaza on Thursday were shot.
UN observers saw some of the approximately 200 patients still receiving care at the al-Shifa Hospital in Gaza City.
Israel has been accused of firing at civilians by Hamas, the group in charge of Gaza, but Israel has responded that there was a “stampede” after its troops fired warning shots.
Global leaders have demanded a thorough investigation.
The incident started in the early hours of Thursday morning when hundreds of people descended on an aid convoy that was being followed by the Israeli military along a coastal road.
The World Food Programme has issued a warning that there will soon be a famine in northern Gaza, where an estimated 300,000 people lack access to clean water and food. The region has received very little aid in recent weeks.
There are gunshots audible in the video from the scene, and witnesses can be seen scurrying over lorries and hiding behind them.
According to the health ministry run by Hamas in Gaza, the incident resulted in at least 112 deaths and 760 injuries.
In a statement on social media, Rear Adm Daniel Hagari, spokesman for the Israel Defense Forces (IDF), said, “Dozens of Gazans were injured as a result of pushing and trampling.”
The IDF’s Lt Col Peter Lerner also told Channel 4 News that a “mob stormed the convoy” and that Israeli troops “cautiously [tried] to disperse the mob with a few warning shots”.
Mark Regev, special adviser to the Israeli prime minister, had earlier told CNN that Israel had not been involved directly in any way and that the gunfire had come from “Palestinian armed groups”, though he did not provide evidence.
Giorgios Petropoulos, head of the Gaza sub-office of the UN Co-ordinator for Humanitarian Affairs (OCHA) told the BBC he and a team sent to al-Shifa hospital found a large number of people with gunshot wounds.
He said all but a handful of the 70 to 80 patients in the emergency room he visited had been injured during the convoy incident.
In addition to those with gunshot wounds, he said doctors had treated many who had fallen down or been trampled – but he was unable to say with certainty which group was larger.
Mr Petropoulos said those with gunshot injuries had suffered wounds in the upper and lower body. One patient told him he had been shot in the chest and who had walked to Shifa to get treatment.
“He said they (Israeli troops) usually shoot in the air. This time, they shot into the thickest part of the crowd,” Mr Petropoulos said.
However, Mr. Petropoulos emphasized that because UN personnel were not present during the incident, it was extremely difficult to determine the exact course of events.
Prior to this, the BBC was informed by Dr. Mohamed Salha, the temporary hospital manager at al-Awda hospital, that 176 patients had been admitted, 142 of whom had gunshot wounds.
He added that the others had suffered broken limbs.
Responding to the incident, UK Foreign Secretary Lord Cameron called the deaths “horrific” and said there “must be an urgent investigation and accountability”.
“This must not happen again,” he said.
He added that the incident could not be separated from the “inadequate aid supplies” entering Gaza and called the current levels “simply unacceptable”.
US President Joe Biden announced that the US would begin dropping aid into Gaza by air, saying: “Innocent people got caught in a terrible war, unable to feed their families. We need to do more, and the United States will do more.”
After Hamas gunmen killed roughly 1,200 people in southern Israel on October 7 and kidnapped 253 more, the Israeli military launched a massive air and ground campaign to destroy the organization, which is banned as a terrorist organization by Israel, the UK, and other countries.
More than 30,000 people, including 21,000 women and children, have died in Gaza since then, according to the health ministry run by Hamas. At least 70,450 people have also been injured.