Israeli forces have destroyed an underground tunnel near the Rantisi Hospital in northern Gaza, Israel Defense Forces spokesman Rear Adm. Daniel Hagari said at a briefing.

The tunnel infrastructure, several kilometers long, “connected different locations in the Strip,” Hagari said. “[Israeli] forces uncovered three tunnel shafts in the area of ​​the hospital, with one of them coming out of a school.”

“The tunnel network included steel doors, command control rooms, emergency rooms, many weapons that were underground and other intelligence materials,” he said.

This comes as Israeli forces “are at a very high level of readiness for the expansion of the war” in northern Gaza, Hagari said.

“We are in the final stages of the attack in the Al Burj area in the northern Gaza Strip, where we killed many terrorists,” he said.

Hagari added that Israel is also “attacking all the infrastructure that Hezbollah has built near the [Lebanon-Israel] border.”

In southern Gaza, Israeli “forces are fighting in several areas,” Hagari said. “One in the area called Al Burj in the central [Gaza] camps, where we are attacking for a third day. The second is in Khan Yunis in the south of the Gaza Strip, a major terror center of Hamas. There we expanded the operation -- today we added another division to this area and we continue to operate there with new combat methods above and below the ground.”

Egyptian President Abdel Fattah El-Sisi met with King Abdullah II of Jordan in Egypt on Wednesday and said "the international community must push towards" a cease-fire.

“Both leaders affirmed their complete rejection of all attempts to liquidate the Palestinian issue or to displace the Palestinians from their lands or their internal displacement, stressing that the only solution that the international community must push towards implementing is an immediate cease-fire, and the entry of relief aid in the necessary quantities and at the speed that will make a real difference in alleviating the suffering of the people of the Gaza Strip,” according to a readout from the Egyptian spokesman for the Presidency Counselor Ahmed Fahmy.

“Talks also focused on regional developments, especially in the Gaza Strip and the humanitarian tragedy it faces, which resulted in thousands of deaths and injuries and the displacement of hundreds of thousands,” the readout added.

ABC News’ Ayat Al-Tawy

The World Health Organization said it delivered much-needed aid and supplies to Al-Shifa Hospital in northern Gaza and the Palestine Red Crescent Society's Al-Amal Hospital in southern Gaza on Tuesday.

Al-Shifa and Al-Amal hospitals are also operating as shelters for displaced residents, sheltering 50,000 people and 14,000 people respectively, according to the WHO.

Gaza has 13 partially functioning hospitals, two minimally functioning hospitals and 21 hospitals that are not functioning at all, causing the hospitals that are functioning to become overloaded with patients who need help, according to the WHO.

"Today I repeat my call on the international community to take urgent steps to alleviate the grave peril facing the population of Gaza and jeopardizing the ability of humanitarian workers to help people with terrible injuries, acute hunger, and at severe risk of disease," WHO Director-General Dr. Tedros Adhanom Ghebreyesus said in a statement.

Tedros said a cease-fire is needed "to spare civilians from further violence and begin the long road towards reconstruction and peace."

Twenty people have been killed in a strike on a building near the Red Cross Al-Amal Hospital in Khan Younis in southern Gaza, according the Hamas-run Gaza Ministry of Health. The death toll is likely to rise, the Gaza Ministry of Health said.

-ABC News Nasser Atta

Gadi Hagi, a 73-year-old American-Israeli hostage and member of Kibbutz Nir Oz, has been confirmed dead, the kibbutz said.

Hagi was killed on Oct. 7 at the kibbutz and his body was taken to Gaza where it's still being held, according to a kibbutz spokesperson.

Hagi’s wife, 70-year-old Judy Weinstein, is wounded and still being held hostage, the kibbutz said.

Hagi and his wife were shot and kidnapped on Oct. 7, according to the Hostage Center.

"Gadi was a man full of humor who knew how to make those around him laugh," the Hostage Center said in a statement. "A musician at heart, a gifted flautist, he played in the IDF Orchestra and was involved with music his whole life."

Hagi was a father of four and a grandfather of seven.

Hagi reportedly has ties to New York.

"May Gadi's memory be a blessing," New York Gov. Kathy Hochul wrote on social media. "There are still many hostages -- including many with New York connections -- being held in Hamas captivity."

President Joe Biden said he was "heartbroken by the news."

"We continue to pray for the well-being and safe return of his wife, Judy," Biden said in a statement. "We are praying for their four children, seven grandchildren, and other loved ones and are grieving this tragic news with them."

Biden said Hagi's daughter joined, via phone, his meeting last week with families of hostages.

"Those families bravely shared with me the harrowing ordeal that they have endured over the past months as they await news of their loved ones," Biden said. "I reaffirm the pledge we have made to all the families of those still held hostage: we will not stop working to bring them home."