Romano was initially taken to a West Bank police station where he briefly met with activists from an Israeli-Palestinian group, Combatants for Peace.
Israeli military spokesman Avichay Adraee said on Twitter that, according to "indications" and unnamed "witnesses", the boy was killed after being hit by stones that had been thrown.
"It was unsurprising to us the Trump administration gave us only two choices: either we lose our relationship with the administration or we lose our rights as a nation", he said. One Israeli soldier has been killed.
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Hamas has led protests since March partially over an Israeli-Egyptian blockade on the territory.
At least three Palestinians, including a child, were killed and 80 others, including 18 children, injured on Friday by the Israeli army near the Gaza-Israel buffer zone.
"He used to go every Friday to the marches like thousands of other people".
Asked about Abdel-Al's death, a military spokeswoman said only that troops had kept to their open-fire regulations.
So far, over 170 Palestinians have been killed and over 19,000 injured in the weekly protests.
Local media reported that around eight protesters managed to cut the barbed wire of the fence on the border in southern Gaza Strip, and infiltrated into Israel for a short while and then returned into Gaza.
Zomlot is said to be back in the West Bank, though his family remains in the United States.
Ari Fuld, 45, who was born and raised in Hillcrest and lived in the settlement of Efrat after moving to Israel, was stabbed by 17-year-old Khalil Jabareen of Yatta near the entrance to a mall close to the Gush Etzion bloc in the West Bank, Israeli authorities said.
Palestinian president Mahmoud Abbas pictured at a meeting of the Palestine Liberation Organization Executive Committee.
The resolution called on UN Secretary General Antonio Guterres to make proposals within 60 days "on ways and means for ensuring the safety, protection, and well-being of the Palestinian civilian population under Israeli occupation", including "recommendations regarding an global protection mechanism".