In a statement, Israel's military said it does "everything possible to avoid harming children." But Hamas, the militant group that rules Gaza, "cynically uses Gaza residents, especially women and children, as human shields and places them at the forefront of the violent riots."
Hamas, which has orchestrated the demonstrations, denies such allegations. Hazem Qassem, a Hamas spokesman in Gaza, said "there is no way to prevent the people from participating. There are entire families (who go) and there is no way to prevent them."
Ever since the demonstrations began in March, children have been a constant presence among the surging crowds — some hurling stones with slingshots or burning tires, others merely watching from afar. While many are brought by parents who hold their hands and carry them on their shoulders, others make their way on their own.
Of the 175 Palestinians killed so far, at least 34 were 18 or under, according to an Associated Press count. Gaza's Health Ministry says 2,295 minors have been hospitalized, 17 of whom have had a limb amputated; at least 5,124 have been injured in all.
Young victims are not a new phenomenon in the region. In the first Palestinian uprising that began in 1987, children and teens often threw stones at Israeli soldiers, who frequently responded with live rounds. According to the Israeli human rights group, B'Tselem, minors comprised about 21 percent of deaths back then. In the latest protests, that percentage is roughly the same.
The Israeli military, which deploys snipers atop pyramid-shaped bunkers positioned at regular intervals along the frontier, says it takes pains to avoid civilian casualties and only uses live fire as a last resort. But it also says it must defend against "terrorist" crowds hurling grenades and firebombs, and stop those who penetrate or damage the fence.
Amnesty International and other human rights groups argue that under international law, the use of live ammunition can only be justified in the face of imminent death or serious injury. Israel argues that is exactly what its forces face. One Israeli soldier was killed by a Hamas sniper during a demonstration last July, and at least six have been wounded.
Video images circulating on social media, however, have also shown unarmed protesters being shot, including some struck while running away or waving the Palestinian flag, Amnesty said. One incident in September showed a 16-year-old boy being shot in the chest while waving his hands in the air; he had just hurled a stone toward the fence, but it's unclear if it had even reached it.
After another teen was shot dead in April, U.N. envoy Nickolay Mladenov asked in a tweet: "How does the killing of a child in #Gaza today help #peace?" Mladenov answered his own question, saying "It doesn't! It fuels anger and breeds more killing."
The protests have been fueled by desperate living conditions in Gaza, a place most residents are prohibited from leaving. More than a decade since Israel and Egypt imposed the blockade on Gaza, unemployment is over 50 percent, tap water has become undrinkable and electricity is sporadic. Israel says the blockade is necessary to prevent Hamas from importing weapons.
When the demonstrations began, Raed Abu Khader told his 12-year-old son Mohammed to stay away, and the boy promised he would. But on Aug. 24, Khader received an urgent phone call from a friend: Mohammed had been shot in the leg at one of the demonstrations held that day.
"He shouldn't have been there," Abu Khader said of the boy, who has been unable to move his left leg since and fears it will be amputated. "But the Israelis should only be shooting to scare children off — not hit them."
It's unclear what Mohammed was doing when the shooting took place. Speaking in a wheelchair surrounded by friends on a Gaza street, he boasted that he had just hung a Palestinian flag on the fence when gunfire rang out. Later, lying in his darkened home with his distraught father looking on, the teen could not answer when asked where he was. Staring at the ground, his brown eyes welled with tears.
Abu Khader said the boy had been transported to the protest site via one of the Hamas-organized buses that park outside Gaza's mosques every Friday. At the end of the ride was a spectacle that is consistently part-war, part-festival: cultural shows, corn on the cob, balloons and Palestinian kites laden with trails of flaming embers meant for Israeli farms. Plus the weekly confrontation itself: Palestinians armed with stones and firebombs battling armed Israeli forces flying spider-like drones equipped with tear gas.
"They see their friends going, and they want to go," Abu Khader said. "They think it's a game. They think they're going to have fun. They don't know how dangerous it is."
The round that struck Mohammed Abu Khader severed the nerves in his leg so completely, he can neither feel nor move his limb at all. If he does not get out of Gaza, his 39-year-old father says, he will likely lose his leg.
Today, the boy often cries. He no longer goes to school. His father says the boy feels useless.
Mohammed al-Dalo, the boy whose father took him to the protest, has been similarly traumatized. His father said he is markedly quieter now.
And like Mohammed Abu Khader, his life may be changed forever.
At a clinic run by Doctors Without Borders, physiotherapist Eyad Abedelaal says Mohammed al-Dalo suffers from "foot drop." Nerve damage means he cannot move his toes up and down; the boy limps when he walks.
They will try to perform another surgery to fix the problem. "But unfortunately, this kind of nerve damage will likely last forever," Abedelaal said. "It means to walk correctly, he'll probably need special shoes for the rest of his life."
Mohammed's father, Mazen al-Dalo, says the boy asked to go back to the protests, but he refused because he doesn't want him to get hurt again.
Still, he has no regrets. "This is the tax you have to pay to achieve the right of return," he said, referencing a deep-held desire to take back land that hundreds of thousands of Palestinians fled or were forced from seven decades ago after the war that created Israel. "Nothing is free. We all have to sacrifice."
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Associated Press writer Fares Akram contributed.