US-Israeli soldier, thought to be taken hostage, confirmed dead in Oct. 7 attack, IDF says

TEL AVIV, Israel -- The Israel Defense Forces on Monday confirmed that missing U.S.-Israeli soldier Omer Maxim Neutra, 21, was among those killed in Hamas' Oct. 7, 2023, attack into southern Israel.

Neutra was believed taken into Gaza as a hostage by militants during the attack. But the IDF said Monday he was killed during the Oct. 7 assault and his body was taken by militants.

Neutra -- originally from New York -- was serving as a tank platoon commander in the 77th Battalion of the 7th Brigade at the time of the Hamas attack. He was among hundreds of security forces personnel killed during the assault.

Neutra's parents have been campaigning for a hostage release deal in the U.S., their activity including public appearances at the White House and the Capitol.

Netanyahu vows to recover body of US-Israeli soldier from Gaza

Israeli Prime Minister Benjamin Netanyahu and his wife, Sara Netanyahu, said in a joint statement Monday they "will not rest or be silent" until the body of Neutra is recovered from the Gaza Strip.

Neutra "fought fiercely at the head of his soldiers to defend the settlements surrounding Gaza, until he fell." Netanyahu's statement said. "We share in the family's heavy grief," it added.

"We will continue to act resolutely and tirelessly until we return all of our captives -- the living and the dead," the statement said.

There are still three American citizens thought to be alive as hostages inside Gaza.

Hamas is still holding around 100 hostages inside Gaza, at least a third of whom are believed to be dead. The Biden administration says it is making another push for a ceasefire and the release of the remaining hostages, after nearly a year of indirect negotiations between Israel and Hamas repeatedly stalled.

Diplomats see a potential opening after last week's ceasefire between Israel and Lebanon's Hezbollah militant group, an ally of Hamas that began launching rocket attacks and trading fire with Israel the day after the October 2023 attack.

The fragile ceasefire has held despite repeated Israeli strikes that have angered Lebanese officials but not yet triggered a response from Hezbollah. Israel says it has acted to thwart potential attacks.

The war in Gaza began when Hamas-led militants stormed into southern Israel, killing some 1,200 people, mostly civilians, and taking around 250 people hostage. More than 100 hostages were released during a weeklong ceasefire in November 2023.

Israel's ongoing retaliatory offensive has killed at least 44,429 Palestinians, more than half of them women and children, according to Gaza's Health Ministry, which does not say how many of the dead were combatants. Israel says it has killed over 17,000 militants, without providing evidence.

The war has destroyed vast areas of the coastal enclave and displaced 90% of the population of 2.3 million, often multiple times.

ABC News and The Associated Press contributed to this report.