Israel-Gaza-Lebanon live updates: 110 dead, including 25 children, in strike on Gaza

Juliette Touma, UNRWA's chief spokesperson, told ABC News the agency is "impossible to replace, especially in a place like Gaza," following the Israeli parliament's decision to ban the organization from operating in Israel.

UNRWA has warned that the move could severely curtail the aid agency's ability to get desperately needed aid into Gaza. Israeli allies abroad -- including in the U.S. -- have also warned that the Israeli parliament's move could exacerbate humanitarian concerns across Palestinian areas in Jerusalem and the West Bank.

"We have the logisticians, the humanitarian experts who know how to deliver humanitarian assistance and how to drive around and reach people in need. These are humanitarian experts who have been doing this for aid for many, many years," Touma said.

Israel has alleged that UNRWA -- which since 1950 has been responsible for supporting Palestinian refugees displaced during Israel's independence war -- is compromised by Palestinian militant groups.

A source from the Israeli Prime Minister's Office told ABC News, "UNRWA is tainted with terror and perpetuates the Palestinian problem. That is why the ban is due."

Touma disputed the assertion. "It is not as if we are the darlings of Hamas," she said. "We have continued to have a very, very bad relationship with Hamas. On a number of occasions throughout the war we have called out publicly against Hamas."

Touma said Israel is under legal obligation "to provide for the services and welfare for the community it's occupying."

Israeli authorities say they will do so without UNRWA help. But Touma said she was skeptical.

"I'm not entirely sure that they know what they're doing, practically speaking, in terms of the ability to cater and to provide humanitarian assistance to 2 million people in Gaza," she said.

The ban on UNRWA, Touma added, will not address the need for an agency serving its role.

"UNRWA exists because of the failure of the international community to reach a solution to the Israeli-Palestinian conflict," she said.

-ABC News' Britt Clennett and Guy Davies

The United Nations Special Coordinator for the Middle East Peace Process Tor Wennesland called the Israeli airstrike in Beit Lahia in northern Gaza "another appalling incident" in a "deadly series of recent mass casualty incidents," in a statement released by the U.N. Secretary-General spokesperson's office Tuesday.

"I unequivocally condemn the widespread killing and injury of civilians in Gaza, and the endless displacement of the population in Gaza," Wennesland said in the statement. "I call on all parties to abide by their obligations under international humanitarian law."

The Biden administration is "deeply troubled" by the Israeli parliament's vote to sharply restrict the U.N. Relief and Works Agency for Palestine Refugees, State Department spokesperson Matt Miller said Tuesday.

"It could shutter UNRWA operations in the West Bank, in Gaza, in East Jerusalem. It poses risks for millions of Palestinians who rely on UNRWA for essential services, including health care and primary and secondary education," Miller said.

"Particularly in Gaza, they play a role right now that, at least today, cannot be filled by anyone else. They are a key partner in delivering food, water and other humanitarian assistance to civilians in Gaza that wouldn't have anyone else to get it from if UNRWA were to go away," Miller said.

Miller said that the U.S. had “made clear our opposition to this bill” to Israeli authorities and said there could be "consequences under U.S. law and U.S. policy for the implementation of this legislation."

"We are going to engage with the government of Israel in the days ahead about how they plan to implement it. We're going to watch and see if there are legal challenges to the law, and if there's any impact by those legal challenges, and then we'll make our decisions after looking to all those facts," Miller said.

-ABC News' Shannon K. Kingston

At least five people were killed and 33 others were wounded after an Israeli strike in the Saida neighborhood of Sidon, Lebanon, on Tuesday, according to the Lebanese Ministry of Public Health.

At least 82 people were killed and 180 were wounded in Israeli attacks across Lebanon Monday, bringing the total number of people killed since Israel's increased attacks on Lebanon to 2,792, and 12,772 people wounded, the ministry said.

At least 138 airstrikes were recorded in various areas of Lebanon on Tuesday, "mostly concentrated in the south, Nabatiyeh and Baalbek-Hermel," a situation report from the Lebanese Prime Minister's Office said Tuesday.

-ABC News' Ghazi Balkiz