On Sunday, three 13-year-old Palestinians boys were killed by the Israeli military, Gaza's Health Ministry said.
In response to Hamas' "grave actions", dozens of IDF fighter jets, attack helicopters and aircraft struck roughly 80 Hamas targets throughout the Gaza Strip, said the Israeli army.
Omar Shakir, Human Rights Watch director in Israel and the Palestinian territories, said the killing of the boys appeared to be a violation of human rights law.
The military probe found that Najjar was seen close to the border fence treating protesters who were wounded by Israeli military fire.
"It's normal for them to go there, and that's why we did not expect them to be martyred", said Salwa Abu Isied, Khaled's mother. It said paramedics who retrieved the bodies on the Gazan side of the fence "confirmed that the children did not have anything [weapons]".
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"The targeting of children or exposing them to risk leading to violence is utterly unacceptable", Stephane Dujarric said.
Last week, the Israeli Air Force responded with air strikes against approximately 20 military targets in the Gaza Strip, after a rocket launched from the Strip hit and seriously damaged a house in the southern Israeli city of Be'er Sheva and another rocket landed at sea near Gush Dan, one of Israel's major cities.
Palestinians and rights groups say protesters have been shot while posing little or no threat.
Mohammed abu Abada, 27, was shot in the chest in protests along the border near Beit Lahia in northern Gaza, a health ministry spokesman told AFP. They also demand an end to Israel's 12-year blockade of the Gaza Strip, which has gutted the coastal enclave's economy and deprived its 2 million inhabitants of many basic commodities.
At least 218 Palestinians have been killed by Israeli fire in Gaza since months of protests began in late March.