Israel has said it has received the remains of another Gaza hostage handed over as part of a US-brokered ceasefire deal.
"Israel has received, through the Red Cross, the coffin of a missing hostage who was handed over to the IDF (military) and Shin Bet forces inside the Gaza Strip," a statement from the prime minister's office said.
The military and Shin Bet later confirmed the remains were back in Israel, and were being sent to "the National Institute for Forensic Medicine, where identification procedures will be carried out".
A senior Hamas official said the group's armed wing had handed over the captive's remains to the Red Cross after receiving them from the Abu Ali Mustafa Brigades - the armed wing of the Marxist-Leninist movement the Popular Front for the Liberation of Palestine (PFLP).
A statement from the Abu Ali Mustafa Brigades said: "In fulfillment of our national responsibility, we... announce that we are handing over the body of one of the Zionist soldiers in implementation of the terms of the agreement."
Prior to this handover, Hamas had returned 12 bodies of hostages to Israel, out of the 28 it had pledged to return as part of the ceasefire agreement in the Gaza Strip.
US envoys met Israeli Prime Minister Benjamin Netanyahu earlier aiming to corral Israel and Hamas to get the Gaza ceasefire plan back on track after an explosion of violence over the weekend that threatened to derail the week-old truce.
Israel and Hamas have both recommitted to the ceasefire plan brokered by US President Donald Trump since yesterday's flare-up in which a Palestinian attack that killed two soldiers prompted an Israeli bombardment killing at least 28 people in Gaza.
However, with even the first stages of the truce shaken by repeated flashes of violence, including today, it was far from clear whether the US will be able to keep pressure on the two sides and maintain momentum to end the conflict.
The latest events reflected the stumbling blocks to keeping the long-sought ceasefire from unravelling and securing a lasting peace after two years of war in Gaza. Key questions of Hamas disarming, further Israeli troop pullbacks and future governance of the Palestinian enclave remain unresolved.
Talks on next phase of ceasefire plan
Mr Trump, keeping pressure on both Hamas and Israel as he seeks to salvage the signature foreign policy achievement of the first year of his second term, said the US was taking many steps to maintain the ceasefire.
He told reporters the "Hamas situation" would be handled quickly but that he had not told Israel to "go in and take care of it".
Watch: Donald Trump says Gaza ceasefire is still in effect
He said that while Hamas was in violation of the agreement, he did not believe its leadership was responsible but that it was facing "some rebellion" in its ranks.
If Hamas leaders do not straighten it out, "we're going to eradicate them if we have to," Mr Trump said at the White House. But he insisted that such actions would not involve US troops on the ground.
During their visit that began today, the US envoys, Steve Witkoff and Mr Trump's son-in-law Jared Kushner, were expected to try to shore up the truce then start talks on the next, more difficult, phase of the 20-step plan.
US Vice President JD Vance is also due to visit Israel tomorrow, with Mr Netanyahu saying the pair would discuss regional challenges and opportunities.
High-level US diplomacy in the region, with talks also due later with Hamas in Egypt, underscored the priority Mr Trump has placed on cementing the ceasefire after proclaiming last week the deal heralded "the historic dawn of a new Middle East".
Read more: Fragile Gaza ceasefire seems to be holding but can it last?
Palestinian medics said three more people had been killed by Israeli tank fire near the "yellow line" inside Gaza demarcating Israel's initial military pullback from the main populated areas.
The Israeli military said forces had fired at militants who crossed that line, which it was started marking with concrete barriers and yellow poles about every 200 meters.
Gaza city residents reported confusion over the line's location due to the lack of a visible boundary.
Hamas to hand over body of another hostage
Mr Witkoff and Mr Kushner's visit to Israel, aimed at discussions on the next phase of Mr Trump's complex ceasefire plan, was scheduled before yesterday's flare-up in violence, according to US and Israeli sources.
Israel is unlikely to publicise any progress in the talks until the remains of more hostages are returned.
Israel believes Hamas could hand over up to five more bodies immediately. Other bodies among 15 still in Gaza may be hard to recover because of destruction in the enclave.
Egypt will host talks in Cairo later with Khalil Al-Hayya, Hamas' exiled Gaza chief, over ways to follow up on implementing the ceasefire, the group said in a statement.
A Palestinian official close to the talks said the group's delegation would discuss formation of a technocratic body to run Gaza without Hamas representation.
Hamas and other allied factions reject any foreign administration of Gaza, as envisaged in the Trump plan, and have so far resisted calls to lay down arms, which may complicate implementation of the deal.
Israel said it launched strikes across the enclave in response to a Palestinian attack that killed two soldiers operating inside the agreed deployment line in Rafah in southern Gaza.
Hamas' armed wing said it was unaware of clashes in Rafah and had not been in contact with groups there since March.
Hamas has detailed what it calls a series of violations by Israel that it says killed 46 people and stopped essential supplies from reaching the enclave.
Israeli Defence Minister Israel Katz said any Hamas militants in areas of Gaza still under Israeli control must leave immediately and anyone remaining beyond the yellow line would be targeted without warning.
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