The Israeli military said Monday an Israeli American soldier who was believed to have been captured alive by Hamas in its Oct. 7, 2023, attack was killed that day and his body taken into the Gaza Strip.

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.