The UN's top human rights body voted through a resolution calling on the council to "urgently dispatch an independent, international commission of inquiry" -- the UN rights council's highest-level of investigation.
The text said the team should investigate all alleged violations and abuses... in the context of the military assaults on large scale civilian protests that began on 30 March 2018, ... including those that may amount to war crimes."
The special UN session comes after six weeks of mass protests and clashes along the Gaza border with Palestinian refugees demanding the right to return to their former homes inside what is now Israel.
The violence has claimed more than 100 Gazan lives, with 60 Palestinians killed and thousands injured in a single day of protests that coincided with Monday's move of the US embassy from Tel Aviv to Jerusalem.
"Nobody has been made safer by the horrific events of the past week," he said.
But Zeid insisted that many of those injured and killed on Monday "were completely unarmed, (and) were shot in the back, in the chest, in the head and limbs with live ammunition", he said, saying there was "little evidence of any (Israeli) attempt to minimise casualties".
He said, "some of the demonstrators threw Molotov cocktails, used slingshots to throw stones, flew burning kites into Israel and attempted to use wire-cutters against the two fences between Gaza and Israel."
But he added: "these actions alone do not appear to constitute the imminent threat to life or deadly injury which could justify the use of lethal force."
Israel has justified its actions, arguing it was necessary to stop mass infiltrations from the blockaded Palestinian enclave which is run by the Islamist Hamas movement.
Israeli ambassador to the UN in Geneva, Aviva Raz Shechter, meanwhile slammed what she called a "shameful" and "biased" resolution.
"This resolution is void of any sense, and deserves nothing less than being torn apart." US representative Theodore Allegra also lamented the council's "biased focus on Israel", charging that the resolution had a "one-sided focus, without any call for investigation of Hamas".
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