Fourteen Israeli and three foreign hostages were released Sunday, the IDF said.
Thousands of people have died and thousands more have been injured since the militant group Hamas launched an unprecedented surprise attack on Israel on Oct. 7 and Israel retaliated with a bombing campaign and total siege of the neighboring Gaza Strip, leaving the region on the verge of all-out war.
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The latest outbreak of war between Israel and Hamas, the Palestinian militant group that governs the Gaza Strip, has passed the four-month mark.
In the Gaza Strip, at least 30,228 people have been killed and 71,377 others have been wounded by Israeli forces since Oct. 7, according to Gaza's Hamas-controlled Ministry of Health.
In Israel, at least 1,200 people have been killed and 6,900 others have been injured by Hamas and other Palestinian militants since Oct. 7, according to the Israel Defense Forces.
There has also been a surge in violence in the Israeli-occupied West Bank. Israeli forces have killed at least 395 people in the territory since Oct. 7, according to the Palestinian Ministry of Health.
The ongoing war began after Hamas-led militants launched an unprecedented incursion into southern Israel from neighboring Gaza via land, sea and air. Scores of people were killed while more than 200 others were taken hostage, according to Israeli authorities. The Israeli military subsequently launched retaliatory airstrikes followed by a ground invasion of Gaza, a 140-square-mile territory where more than 2 million Palestinians have lived under a blockade imposed by Israel and supported by Egypt since Hamas came to power in 2007. Gaza, unlike Israel, has no air raid sirens or bomb shelters.
In response to news that Hamas will delay the release of hostages, with the terrorist group accusing Israel of violating the cease-fire agreement, the Biden administration said it is working on the implementation of the deal.
"We are working with Qatar, Egypt, and Israel on implementation of the deal," a senior administration official told ABC News.
-ABC News' Selina Wang
Doctors Without Borders released a statement calling for an extension for a sustained ceasefire, saying that four days is not enough.
"After being under relentless bombing for more than six weeks, any respite for the people in Gaza is welcome, especially if it allows them to have access to medical supplies, food, and water," Doctors Without Borders said in a statement.
"Four days, however, is not nearly enough to organize a delivery of aid that can measure up to the immense needs. We remain deeply concerned at the prospect that after a short-lived relief, people will fall back into a sealed-off complete war zone," it added. "We continue to call for a sustained ceasefire as the only way to stop indiscriminate killings and civilian harm and allow the delivery of desperately needed humanitarian aid on a meaningful scale."
-ABC News' Zoe Magee
Israeli Defense Forces' Chief of Staff Lt. Gen. Herzi Halevi said the military will immediately return to striking the Gaza Strip once the ceasefire with Hamas ends. Halevi told soldiers the ceasefire and hostage deal would not have happened without the IDF’s pressure on Hamas.
"We do not intend, do not want, and are not ready to stop this effort before we return all the hostages… it is our moral duty to bring them back,” he said. adding the IDF will use the pause in fighting to "study, to better prepare our abilities and also to rest a little."
"And we will return immediately at the end of the ceasefire to attacking Gaza, to maneuver in Gaza. We will do it to dismantle Hamas and also to create great pressure to return as quickly as possible and as many hostages as possible, down to the last one of them," he said. "We have an obligation to fight and also to risk our lives so that [Israeli citizens] can return to live in safety, and we have hostages that we will do everything to bring them home."
As he toured the Gaza Strip Saturday, Israeli Defense Minister Yoav Gallant told Israeli commanders and soldiers that its forces will not leave the Gaza Strip until all of the hostages are returned to Israel, and any future negotiations with Hamas will be carried out amid the fighting.
"We will not leave Gaza until all the hostages are brought back home. We will find the opportunity to bring [home] additional hostages; any negotiation will be held under fire," he said. "We cannot leave Gaza and stop the war until we reach a situation in which we bring back all the hostages -- because we have many more [held captive]."
Hamas announced that it will be delaying the release of Israeli hostages, accusing Israel of violating the cease-fire agreement regarding aid trucks and the agreed-upon terms for the release of Palestinians imprisoned in Israel.
The Al-Qassam Brigades -- the armed wing of Hamas -- said it had decided to delay Saturday's scheduled second round of hostage releases until Israel committed to allowing aid trucks to enter northern Gaza. Hamas was expected to release 13 Israeli hostages in exchange for the release of 39 Palestinians imprisoned in Israel on Saturday, sources told ABC News.
"The Al-Qassam Brigades decides to delay the release of the second batch of hostages until the occupation adheres to the terms of the agreement regarding the entry of relief trucks into the northern Gaza Strip, and due to its failure to adhere to the agreed-upon criteria for releasing prisoners," Al-Qassam Brigades said in a statement.
Hamas leader Osama Hamdan, who is based in Lebanon, said relief trucks that arrived in northern Gaza today were half of the number that was agreed upon.
"There are violations committed by the Israelis in implementing the terms of the truce, some of which occurred yesterday and were repeated today," Hamdan said Saturday, adding that another issue at stake was the reported shooting of two Palestinians on Friday as they tried to reach northern Gaza.
A senior Israeli political source told ABC News that Israel did not violate the agreement. The IDF said about 200 trucks carrying humanitarian aid are expected to enter Gaza today, after 200 trucks with aid entered Gaza yesterday via the Rafah crossing and delivered their cargo to international aid organizations.
The Palestinian Red Crescent said 61 trucks carrying food, water and medical supplies headed to northern Gaza on Saturday, the largest aid convoy to reach the area since the start of the war.
-ABC News' Ayat Al-Tawy, Nasser Atta, Jordana Miller
