Youssef Shtayyeh came home from school on an April afternoon, dropped his bag in the hallway and headed straight back out to join his friends.Minutes later, he was dead -- shot by an Israeli soldier, just 100 metres (yards) from his home.He was 15. His is not an isolated case.Since Israel launched a major military operation against armed Palestinian groups in the northern West Bank in January 2025, one Palestinian minor has been killed every week on average across the territory, up from one every three weeks in 2021, according to UNICEF.Seventy teenagers, mostly aged 15 to 16, have been killed to date, 65 of them by Israeli forces, according to a UNICEF report dated May 12.Then came Youssef Kaabnah, 16, killed on May 13.Then Fahd Oweis, 15, two days later.The Israeli military said both had "hurled stones" at soldiers.It is almost certainly what Shtayyeh had been doing too, on April 23, in Nablus -- the largest city in the northern West Bank, a Palestinian territory occupied by Israel since 1967.Youssef and his friends were on a side street above a main road when a couple passing in a car spotted them throwing stones -- and the military convoy below.One jeep stopped. Then the others."A soldier got out, then two more. They started shooting at the kids," the passing driver told AFP, declining to be named for safety reasons.- 'Designed to kill' -A neighbour filmed what followed.Two shots. Then screams.Youssef grabbed the car door. "He said, 'Please don't leave me, I'm scared. Take me to my father, take me home,'" the driver recalled. Youssef's father Sameh Shtayyeh, a 48-year-old building contractor, told AFP he had no idea what had caused the soldiers to open fire on his son as he "wasn't there".