"I am extremely concerned that by the end of today - and next Friday, and the Friday after that - more unarmed Palestinians who were alive this morning will have been killed, simply because, while exercising their right to protest, they approached a fence, or otherwise attracted the attention of the soldiers on the other side", Zeid said.
Earlier on Friday, the UN's human rights chief Zeid Ra'ad al-Hussein criticised Israel for using what he called "excessive force", and said live fire had caused a "staggering number" of injuries.
Another 15-year-old Palestinian was killed in last week's Friday protests, which has raised the death toll to at least 45 over the consecutive wave of protests dubbed the "Great March of Return". There have been no reports of Israeli fatalities. In other scenes, a small group lobs stones at an Israeli military vehicle on the other side of the fence.
Palestinian demonstrators run for cover during clashes with Israeli troops at a protest demanding the right to return to their homeland, at the Israel-Gaza border in the southern Gaza Strip, April 27, 2018.
A Palestinian child died of serious wounds sustained during the protests at the Gaza borders on Friday.
Israel claims that it is acting in self-defense as the protests are attempting to "harm or breach the security infrastructure" between Gaza and Israel involving the use of firebombs and explosive devices at or near security checkpoints.
Condemning the "brutalities and crimes against Palestinian civilians", Mansour said the Israeli forces' actions should be stopped and human rights violators be held accountable.More news: Fortnite is Now the Biggest Free-to-Play Console Game Ever
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Peace talks between Israel and the Palestinians have been stalled for several years and Israeli settlements in the occupied territories have expanded.
"The Israeli Occupation deployed its Army, including snipers, to attack peaceful Palestinian demonstrators, including unarmed women, men and children".
The Great March of Return movement is officially scheduled to continue until May 15, known as Nakba Day, marking the expulsion of hundreds of thousands of Palestinians during the creation of Israel. Hundreds more were hit by rubber-encased steel bullets or are suffering tear gas exposure, after Israeli forces showered the area with tear gas canisters from behind their heavily fortified positions.
Israel's use of live fire has drawn global criticism. It is hard to see how tire-burning or stone-throwing, or even Molotov-cocktails thrown from a significant distance at heavily protected security forces in defensive positions can be seen to constitute such threat.
Relatives and Palestinian faction leaders gathered in a show of respect to greet the body of Fadi al-Batsh as it entered Gaza through the Egyptian border.
A spokesperson for the Israeli military said that Israel is having an appropriate response to "riots" and responding in accordance with "riot dispersal means while also firing in accordance with the rules of engagement". The increasing desperation of broad layers of Gaza youth is a product of both the unbearable conditions facing the more than 1.9 million Palestinians blockaded in what is the largest open-air prison on earth, and the lack of any viable perspective provided by a supposed "two-state solution".