United Nations Secretary-General Antonio Guterres is deeply concerned about developments in Jenin.
A spokesperson said Israeli forces hit the West Bank city with drone strikes in one of the largest operations in the area in 20 years.
Guterres "affirms that all military operations must be conducted with full respect for international humanitarian law," Deputy UN spokesperson Farhan Haq said in a statement.
It follows the UAE's strong condemnation of the attacks.
US military says it turned away blockade runner trying to reach Iranian port
The US military has announced that it fired a missile into the engine room of a vessel trying to get through the US blockade of Iran on Friday.
Jubilant PSG supporters spill onto Paris streets, some clash with police
Paris police deployed thousands of officers to control crowds at some of the city's hot spots, using teargas and arresting dozens following the win of the city's football club Paris St Germain in Saturday's Champions League final.
WHO chief urges safe burials in visit to heart of Ebola outbreak
The World Health Organisation (WHO) chief has travelled on Saturday to the Congolese province hardest hit by an Ebola outbreak, urging residents to seek treatment and practice safe burials as officials scramble to contain the fatal disease.
Rescuers pull four from flooded cave in Laos
Rescuers pulled four people from a flooded cave in Laos on Saturday, Thai volunteers said, hours after another man was brought out late on Friday.
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