Fighting is ongoing after Hamas launched an attack on Israel on Oct. 7.
At least 1,400 people have died and 3,400 others have been injured in Israel after the militant group Hamas launched an unprecedented incursion from air, land and sea on Oct. 7, Israeli authorities said.
In Gaza, 3,000 people have been killed and another 12,500 were injured, according to the Palestinian Ministry of Health.
Tensions are high with the prospect of ground war and evacuation orders for Gaza after the Israel Defense Forces called for "all residents of Gaza City to evacuate their homes" and "move south for their protection" early Friday, saying residents should move "and settle in the area south of the Gaza River." The announcement was made, according to the IDF, because it plans to "operate significantly in Gaza City in the coming days" and wanted "to avoid harming civilians."
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On the morning of Oct. 7, sirens echoed across Israel as Hamas terrorists began a full-fledged surprise attack from the air, sea and ground. Hundreds of armed Hamas fighters stormed into Israel from Gaza, charging into cities and gunning down citizens.
Israeli forces responded by sending wave after wave of bombs into Gaza, killing thousands, trapping civilians and raising fears of a wider conflict in the Middle East.
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Israeli ambassador to the United Nations Gilad Erdan said "between 100 and 150" hostages are currently being held by Hamas in the Gaza Strip.
"We estimate a number that is between 100 and 150. I think it’s an unprecedented number," Erdan told CNN during an interview late Monday. "It includes Americans. We don't know the exact number."
Hamas fighters are believed to be "still hiding" in some communities in southern Israel even after the Israeli military took back control, according to Israel Defense Forces spokesman Maj. Doron Spielman.
"We are in control of the communities, but we actually assume that there are Hamas terrorists that are still hiding in these areas, including in the road where we are now," Spielman told ABC News during an interview Monday in Sderot, Israel. "In all these communities, we've seen terrorist come out of hiding. Just yesterday, they took over an ambulance."
"We're still being very, very careful," he added. "This is a war zone with active terrorists that are operating here."
Sderot is a southwestern Israeli city located near the county's border with the Hamas-ruled Gaza Strip. A police station there was stormed by Hamas fighters on Saturday as part of the militant group's wider incursion, leaving at least six Israeli police officers dead. The IDF then bombed the police station with the Hamas fighters inside, demolishing it.
Hamas fighters and other Palestinian militants are "striking strategic locations" along the border fence, allowing them to drive through in pickup trucks, Spielman said. Civilians in some of the local communities have been ordered to evacuate, while others have left voluntarily, according to Spielman.
"We do have a lot of ground troops in this area. We have a lot of tanks. We have, in addition, artillery. And we're prepared forever for anything," he said. "And if it happens, the next stage, it's going to happen here because this is the area that was the flashpoint and this is the area we're going to be presenting ourselves and finishing this battle. We, of course, have no choice but to finish."
When asked about the mounting casualties of Palestinian civilians in Gaza as a result of the IDF's retaliatory airstrikes, Spielman said: "We always try to avoid civilian casualties. However, I would say that this is war and our first priority here is to destroy Hamas."
-ABC News' Angus Hines and Ian Pannell
The Israel Defense Forces said Tuesday morning that its fighter jets had struck more than 200 "terror targets" in the Gaza Strip overnight.
All targets were located in the Rimal neighborhood of Gaza City and the southern city of Khan Yunis, which the IDF said are both used as "terror hubs" for Gaza's militant rulers Hamas and that "a large number of terror attacks against Israel are directed there."
Among the targets struck were a Hamas weapons storage site and a Hamas operational command center, both located inside a mosque, according to the IDF.
-ABC News' Jordana Miller
The FBI said it is working "aggressively" to investigate reports of Americans who have been impacted by the Hamas attacks on Israel.
"We are closely coordinating with our counterparts in the region as well as other international partners," the FBI said in a statement posted on X, the platform formerly known as Twitter, on Monday.
The statement continued: "Through our Legal Attache' office in Israel, FBI personnel are working with our partners on the ground to locate and identify any impacted Americans. Reports of deceased, injured or missing Americans are being treated with the utmost urgency and aggressively investigated. The FBI's Victim Services Division is coordinating with the Department of State to assist, as necessary, with family engagement."
