The Israeli army said its forces were "mapping out the homes of the terrorists. Picture used for illustrative purposes only.
Uday Salah, 17, was "killed by a bullet to the head fired by the Israeli occupation soldiers in Kafr Dan, Jenin governorate", the Palestinian health ministry said.
The Israeli army said its forces were "mapping out the homes of the terrorists who killed Major Bar Falah and arresting suspects throughout the West Bank".
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Falah was killed on Wednesday in clashes near the Jalameh checkpoint, north of Jenin, which also killed Palestinians Ahmed Abed and Abdul Rahman Abed.
Palestinian news agency Wafa reported that soldiers had raided the family homes of both Ahmed and Abdul Rahman Abed, and arrested "Amer Taha Abed, who is the cousin of the martyr Ahmed Abed."
The Al-Aqsa Martyrs' Brigades, the armed wing of Palestinian president Mahmud Abbas's secular Fatah movement, had claimed responsibility for the Israeli major's death.
Jenin has suffered frequent violence in recent months, part of a deadly flare-up that began in mid-March following deadly attacks on Israeli targets, mostly by Palestinians.
In response, Israel has launched near nightly raids on West Bank towns and cities that have killed dozens of Palestinians, including fighters.
Last week, Israeli army chief Aviv Kohavi said "around 1,500 wanted people were arrested and hundreds of attacks prevented" in the operations.
Israel has occupied the West Bank since 1967 when it captured the territory from Jordan.
Since the conflict began on Friday, 31 Palestinians — including six children — have been killed, while 275 people have been wounded, said health authorities.
Israeli troops shot and killed a teenage Palestinian boy as clashes erupted when they entered a volatile town in the occupied West Bank early on Saturday, the Palestinian health ministry and local media said.
"An IDF (army) officer was killed overnight during operational activity adjacent to the Gilboa Crossing during an exchange of fire with Palestinian terrorists," an army statement said.
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