Israel-Gaza updates: IDF says 2 hostages rescued from Gaza

Israeli airstrikes killed at least 28 Palestinians in Rafah early Saturday, just hours after Israel's Prime Minister Benjamin Netanyahu said he asked the military to plan for the evacuation of hundreds of thousands of people from the southern Gaza city ahead of a ground invasion.

Netanyahu did not provide details or a timeline but the announcement set off widespread panic as more than than half of Gaza's 2.3 million people are packed into Rafah, many after being uprooted repeatedly by Israeli evacuation orders that now cover two-thirds of Gaza's territory.

It's not clear where much of that population could turn to next as word of the potential invasion plans capped a week of increasingly public friction between Netanyahu and the Biden administration.

U.S. officials have said an invasion of Rafah without a plan for the civilian population would lead to disaster.

The Israel Defense Forces presented information to the family of hostage Yossi Sharabi, who died in Gaza, telling the family that Sharabi may have been killed when a building adjacent to an IDF target in Gaza collapsed, ABC News has learned. It’s also possible Sharabi may have been killed by Hamas, the IDF said.

Sharabi was confirmed dead in mid-January, but this is the first time the IDF has presented their findings on how Sharabi may have died to his family.

The IDF has determined that the buildings its forces hit was a "legitimate target," but also found "lessons" that were "learned regarding target approval processes and the required dialogue between all relevant military authorities for the approval of a target," when reviewing how Sharabi died, ABC News has learned.

Israeli Prime Minister Benjamin Netanyahu has ordered the Israel Defense Forces to come up with a "dual plan" to evacuate the civilian population in Rafah in the southern Gaza Strip before "disbanding" Hamas battalions allegedly located there, according to his office.

"It is impossible to achieve the war objective of eliminating Hamas and leaving four Hamas battalions in Rafah," Netanyahu's office said in a statement Friday. "On the other hand, it is clear that a massive operation in Rafah requires the evacuation of the civilian population from the combat zones."

"That is why the Prime Minister directed the IDF and the defense establishment to bring to the cabinet a dual plan for both the evacuation of the population and the disbanding of the battalions," the office added.

Rafah is the southernmost governorate of Gaza, where more than half of the 2.3 million population has sought refuge after being displaced from their homes amid Israel's military offensive in the Hamas-ruled enclave, according to the United Nations. The U.N. and other aid organizations have expressed concern over where civilians would go if Rafah, which the IDF previously designated a safe zone, becomes the next target in Israel's war against Hamas.

-ABC News' Jordana Miller and Morgan Winsor

The United Nations International Children's Emergency Fund on Friday urged Israel and Hamas to refrain from escalating fighting in Rafah, the southernmost governorate in the war-torn Gaza Strip, where more than a million people have sought refuge after being displaced from their homes.

"UNICEF is urgently calling on the parties to refrain from military escalation in Rafah Governorate in Gaza where over 600,000 children and their families have been displaced -- many of them more than once," UNICEF Executive Director Catherine Russell said in a statement. "An escalation of the fighting in Rafah, which is already straining under the extraordinary number of people who have been displaced from other parts of Gaza, will mark another devastating turn in a war that has reportedly killed over 27,000 people -- most of them women and children."

"Thousands more could die in the violence or by lack of essential services, and further disruption of humanitarian assistance," she added. "We need Gaza's last remaining hospitals, shelters, markets and water systems to stay functional. Without them, hunger and disease will skyrocket, taking more child lives."

ABC News' Nasser Atta, Edward Szekeres and Morgan Winsor