The slain Palestinians were not immediately identified. The Palestinian health ministry said one of them was a minor.

The violence marked a rare use of Israeli airpower in the territory. During the clashes, Palestinian group detonated a roadside bomb next to an Israeli military vehicle. At least 29 Palestinians were wounded, six seriously, and Israeli media said a number of Israeli soldiers were hurt.

The escalation was the latest in more than a year of near-daily violence that has wracked the West Bank.

The Israeli military said troops came under fire during an arrest raid in Jenin and shot back at Palestinian gunmen. Israeli media reported that multiple Israeli troops were wounded in the fighting but did not provide more details.

"As the security forces exited the city, a military vehicle was hit by an explosive device, damaging the vehicle,” the army said, adding that helicopters "opened fire toward the gunmen in order to assist in extraction of the forces.”

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Unconfirmed amateur video footage from Jenin appeared to show a roadside explosive targeting an Israeli armored vehicle. Another video posted online appeared to show Israeli military helicopter launching a rocket during the ongoing army operation.

The Israeli military rarely uses aircraft in its operations in the occupied West Bank. Israeli media reported that it was the first use of an attack helicopter in the territory since the Palestinian uprising in the early 2000s.

The Palestinian Health Ministry identified those killed as Khaled Asasa, 21, Qassam Abu Sariya, 29, and 15-year-old Ahmed Saqr, and said at least six others were seriously wounded in the shootout.

Hussein al-Shekh, a senior Palestinian official, accused Israel of waging "a fierce and open war” against the Palestinian people and said President Mahmoud Abbas would make "unprecedented decisions” in an upcoming emergency meeting.

Associated Press