Israel-Gaza updates: Israel says ground operation underway in southern Gaza
The IDF said it's carried out 10,000 airstrikes in the Gaza Strip.
The temporary cease-fire between Hamas and Israel ended early Friday, and Israel has resumed its bombardment of Gaza.
The end of the cease-fire came after Hamas freed over 100 of the more than 200 people its militants took hostage during the Oct. 7 surprise attack on Israel. In exchange, Israel released more than 200 Palestinians from Israeli prisons.
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What we know about the conflict
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.
Israel says negotiations on Monday's hostage list 'are continuing'
The Israeli Prime Minister's Office announced Monday afternoon that negotiations with Hamas "on the list of those slated to be released under the framework of the hostages release outline are continuing."
"We are aware of the tension in the families and will release additional information when possible," the office said in a statement. "We request to refrain from disseminating rumours and unreliable information."
A fourth prisoner swap between the warring sides was expected to take place Monday between 4 and 6 p.m. local time on the final day of the agreed upon cease-fire, which is set to expire Tuesday at 7 a.m. local time.
-ABC News' Dana Savir and Morgan Winsor
Kirby talks possible release of more American hostages in Gaza
U.S. National Security Council spokesperson John Kirby said Monday that an estimated seven to 10 American hostages remain in the war-torn Gaza Strip.
"We know that there are other Americans being held hostage. We're certainly going to do everything we can hour by hour to get them released," Kirby told ABC News' George Stephanopoulos in an interview on "Good Morning America."
"We know that there were 10 unaccounted for, missing Americans," he added. "We think that the large majority of them are in this hostage population. But we don't have great fidelity past that."
Kirby noted that it’s also "difficult to know" exactly how many total hostages are in Gaza and which groups are currently holding them.
"We have to assume there are a couple hundred or so," he said. "We also have to assume, George, that Hamas isn't holding all of them -- that the other groups, potentially the Palestinian Islamic Jihad, for instance, another radical extremist terrorist group there operating out of Gaza, could be holding some. But it's going to be up to Hamas now to track all them down and see if we can arrange for their exchange."
With a four-day cease-fire between Gaza's militant rulers, Hamas, and Israel set to expire Tuesday morning, a fourth and final prisoner swap is expected to take place Monday between 4 and 6 p.m. local time, according to Israeli authorities.
"We're into day four now and so our hope and expectation is yet another instalment of hostages will get released sometime later today," Kirby told ABC News. "There have been delays in the past couple of days. We'll see if we have to work through any delays today."
"We would very much like to see this pause continue and more hostages exchanged as a result," he continued. "Isreal has said they're willing to do that. It's really going to be up to Hamas now to determine whether they're willing to come up with more hostages in coming days."
-ABC News' Morgan Winsor
Sources say there are 'problems' with Monday's hostage list
Discussions are being held on a list that was received overnight regarding the final group of hostages who are expected to be released by Hamas in the Gaza Strip on Monday, according to the Israeli Prime Minister’s Office.
The office said in a statement on Monday morning that the list "is now being evaluated in Israel" and "additional information will be issued when possible."
Sources told ABC News that there are "problems" with the current list for Monday.
Monday's prisoner swap between Hamas and Israel -- the fourth round amid a four-day cease-fire -- is expected to take place between 4 and 6 p.m. local time.
-ABC News' Jordana Miller, Dana Savir and Morgan Winsor
Israel’s President Herzog to meet with Elon Musk Monday
Israel’s President Isaac Herzog is set to meet with Elon Musk on Monday afternoon, his office said Sunday.
"Against the background of the ongoing war with Hamas, President Isaac Herzog will tomorrow (Monday), meet with businessman Elon Musk, who is visiting Israel," the president's office said in a statement Sunday evening.
"[R]epresentatives of the families of hostages held by Hamas, who will speak about the horrors of the Hamas terror attack on October 7, and of the ongoing pain and uncertainty for those held captive," the statement continued. "In their meeting, the President will emphasize the need to act to combat rising antisemitism online."
The meeting will be closed to the media.
The Tesla boss also owns social media platform X, formerly Twitter.
-ABC News’ Jordana Miller
12 hostages released in latest exchange: IDF
Twelve hostages are back in Israeli territory in the latest exchange, according to the Israeli government.
The hostages include 10 Israelis and two foreign nationals, both from Thailand, officials said.
The Israeli citizens were identified as Tamar Metzger, 78; Ditza Hayman, 84; Norlin Babdila, 60; Ada Sagi, 75; Ophelia Edith Roitman, 77; Rimon Kirsht, 36; Merav Tal, 53; and the Leimberg family -- Gabriella Leimberg, 59, Mia Leimberg, 17, and Clara Marman, 63.
The IDF said the hostages were taken through Egypt before heading to a meeting point in Kerem Shalom, in Israel.
Five of the women -- Metzger, Hayman, Ada Sagi, Roitman and Tal -- were residents of Kibbutz Nir Oz, one of the communities hit hardest by Hamas' Oct. 7 attack.
"They were held captive, in harsh conditions and deprived of essential medical care. Two of the women released have been separated from their husbands, who remain in captivity," the kibbutz said in a statement. "The Nir Oz community is committed to support them, and their families, through the long recovery process ahead."
Thirty Palestinian prisoners were released in exchange for the hostages, according to Qatari officials.
-ABC News' Will Gretsky