Israeli forces hit the city of Jenin with drone strikes during an overnight operation on Monday that left at least seven people dead.
The Palestinian health ministry confirmed at least seven people had been killed and 27 wounded in Jenin, while another man was killed in the city of Ramallah after being shot in the head at a checkpoint.
As daylight broke on Monday, thick black smoke from burning tyres set alight by residents swirled through the Jenin streets while calls to support the fighters rang out from loudspeakers.
A spokesman for Palestinian President Mahmoud Abbas called the operation "a new war crime against our defenceless people".
The Israeli military said the targeted building functioned as an "advanced observation and reconnaissance centre" and a weapons and explosives site as well as a coordination and communications hub.
It provided an aerial photograph showing what it said was the target and which indicated the building hit was near two schools and a medical centre.
A spokesman said it would last as long as needed and officials suggested forces could remain for days. "An operation doesn't end in one day," Energy Minister Israel Katz, a member of the security cabinet, told Army radio.
Israeli Defence Minister Yoav Gallant said his forces were "closely monitoring the conduct of our enemies...The defence establishment is ready for all scenarios."
President Donald Trump said on Friday the US was getting very close to meeting its objectives as it considers winding down its military efforts in the Iran war and called on countries that use the Strait of Hormuz to guard and police it "as necessary".
The Israeli military said early on Saturday it was striking Hezbollah targets in Beirut, after issuing an evacuation warning for seven neighbourhoods in the southern suburbs of the Lebanese capital.
The US military is deploying thousands of Marines to the Middle East, officials told Reuters on Friday, as President Donald Trump accused NATO allies of cowardice over their reluctance to send forces to help open the Strait of Hormuz.
A fire that broke out around lunchtime on Friday at a car parts factory in the South Korean city of Daejeon on Friday, has left 10 people dead, 25 seriously injured and 34 with minor injuries, the country's safety ministry said on Saturday.
The Kuwait Petroleum Corporation (KPC) has announced that the Mina Al-Ahmadi Refinery, operated by Kuwait National Petroleum Company (KNPC), came under drone attacks early on Friday, with a fire breaking out at several units as a result.