In a statement from his spokesperson on Monday, Mr. Guterres affirmed that all military operations must be conducted with full respect for international humanitarian law.
The incursion follows another operation in the camp on 19 June, which left four Palestinians killed and 91 others injured.
The UN’s humanitarian affairs coordination office (OCHA) said on Tuesday that as a result of the air and ground operations taking place in the West Bank town, 10 Palestinians including three children were killed, according to the Palestinian Ministry of Health.
At least 100 others have been injured, of whom 20 are reportedly in critical condition, OCHA said. Thousands of residents have reportedly left the camp since the operation began.
In an apparent retaliatory attack in the Israeli city of Tel Aviv on Tuesday, seven people were injured, three seriously, when a Palestinian man drove into pedestrians standing outside a shopping centre, according to news reports.
The attacker was shot and killed by an Israeli citizen at the scene. Palestinian militant group Hamas reportedly described the attack as a direct response to the military operation in Jenin.
Airstrikes in Jenin “significantly damaged” structures in which people were living in both the camp and surrounding neighbourhoods. The agency warned that due to damage to infrastructure, most of the Jenin camp has lost access to drinking water and electricity.
The UN agency for Palestine refugees (UNRWA), which runs four schools, one health centre and other facilities in the Jenin camp, said that many residents were in urgent need of food, drinking water and milk powder for children.
As of Monday, all UNRWA installations in the camp, operated by 90 staff members, were out of service due to the heavy exchanges of fire, the agency reported.
Meanwhile, the World Health Organization (WHO) said on Tuesday that the extent of people’s injuries was placing strain on the “fragile and underfunded” health system and that it was working with partners to deliver more life-saving medical supplies to Jenin Hospital.
UN humanitarians said that the destruction of roads in the refugee camp was restricting access for medical teams and ambulances, and Israeli forces were conducting checks on vehicles, including ambulances, at the entrance of the camp.
According to the UN health agency, ambulances with medical teams have been prevented from entering parts of the refugee camp and reaching persons who have been critically injured.
At least two hospitals have also been affected by attacks involving use of ammunition and gas canisters.
“Attacks against healthcare, including prevention of access to persons injured, are extremely concerning”, WHO said, calling for “respect and protection of healthcare”, including safe passage to health services in Jenin and across Palestine.
The agency recalled that there had been a “significant increase” in attacks on healthcare in the West Bank this year. The first five months of 2023 saw “at least” 124 WHO-documented attacks, resulting in 39 health worker injuries and affecting 117 ambulances.
The UN human rights chief Volker Türk said in a statement released later on Tuesday that the extensive Jenin operation and car ramming attack in Tel Aviv showed “violence only begets more violence.”
“The killing, maiming and the destruction of property must stop.”
He said the scale of the Israeli operation “raised a host of serious issues” regarding international human rights standards.
Some of the methods and weapons used by Israeli forces “are more generally associated with the conduct of hostilities in armed conflict, rather than law enforcement.”
He said in the context of the occupation, deaths resulting from such airstrikes “may also amount to wilful killings”.
“International human rights law sets clear obligations on Israel, as the occupying power, to ensure that all operations are planned and controlled so as to minimize, to the greatest extent possible, resort to force and in particular lethal force”, the High Commissioner said.
Israel is also obliged to ensure timely access to medical care to all those injured during the violence, he added.