US Vice President JD Vance is expected to arrive in the region to shore up the fragile ceasefire, which has teetered over the past few days.
Israel confirmed Hamas released the body of Tal Haimi, who was killed on October 7, 2023, and abducted from Kibbutz Nir Yitzhak on the Gaza border.
Haimi, 42, a fourth-generation resident of Kibbutz Nir Yitzhak, was part of the emergency response team. He had four children, including one born after the attack.
Under the terms of the ceasefire, Israel is still waiting for Hamas to turn over the remains of 15 deceased hostages. Thirteen bodies have been released since the ceasefire began.
After trading strikes with Israel earlier this week, Hamas negotiators reiterated the group is committed to ensuring the war "ends once and for all".
"From the day we signed the Sharm el-Sheikh agreement, we were determined and committed to seeing it through to the end," Hamas chief negotiator Khalil al-Hayya, who is in Cairo, told Egypt's Al-Qahera News television.
He said the Sharm el-Sheikh summit, hosted by Egyptian President Abdel-Fattah el-Sissi and US President Donald Trump, represented "an international will declaring the war in Gaza is over".
Al-Hayya said Hamas received assurances from mediators and Trump that "give us confidence that the war has ended for good".
On Sunday, Israel's military said militants had fired at troops, killing two Israeli soldiers in areas of Rafah in southern Gaza that are Israeli-controlled, according to agreed-on ceasefire lines.
Retaliatory strikes by Israel killed 45 Palestinians, according to the strip's Health Ministry, which says a total of 80 people have been killed since the ceasefire took effect.
Similar strikes occurred on Monday in Gaza City and Khan Younis, where Israel said militants had crossed the yellow ceasefire line and posed an "immediate threat" to its troops.
The Israeli military said on Monday it was using concrete barriers and painted poles to more clearly delineate the so-called yellow line in Gaza where troops have withdrawn to. It said several instances of violence have occurred.
On Tuesday, Qatar, a key mediator in the ceasefire, denounced Israel in a speech by its ruling emir. Sheikh Tamim bin Hamad Al Thani said his nation would continue to serve as a mediator as a ceasefire holds in the Gaza Strip.
Sheikh Tamim specifically called Israel out for its "continued breaches of the ceasefire" in Gaza, as well as its expansion of settlements in the West Bank.
A senior health official in the Gaza Strip said the bodies of Palestinians that Israel returned to Gaza as part of the ceasefire deal bore "evidence of torture" and called for an investigation.
Israel returned 150 bodies of Palestinians to Gaza as part of the ceasefire deal, which required the release of all of Israeli hostages — living and deceased — in return for the release of more than 1900 Palestinian prisoners and many bodies of Palestinians.
So far, only 32 of the returned bodies have been identified, according to the Gaza Health Ministry.
Dr Muneer al-Boursh, the general director of the Health Ministry, said in a post on social media some of the bodies had returned with evidence of being bound with ropes and metal shackles, blindfolds, deep wounds, abrasions, burns, and crushed limbs.
"What has happened constitutes a war crime and a crime against humanity," he said, calling for the United Nations to launch an "urgent and independent international investigation".
The Israel Prisons Service denied prisoners had been mistreated.
