The Israeli government notified the United Nations of its plans to terminate cooperation with the United Nations Relief and Works Agency (UNRWA) in a letter to the president of the U.N. General Assembly on Sunday.

UNRWA is the main U.N. agency operating in Gaza and is responsible for coordinating and supplying humanitarian aid. It also operates in the West Bank. The Israeli government has accused UNRWA of having ties to Hamas. After the initial accusations, the U.N. conducted an internal investigation, and some UNRWA staff members were fired.

Israel maintains that UNRWA still has ties to Hamas. But aid organizations warn if the agency stops operating in Gaza, the humanitarian crisis there will only worsen.

Israel's termination of UNRWA in the country follows legislation passed by Israel’s parliament at the end of October severing the country’s ties with the organization.

Israel’s governmental body passed two bills -- one banning UNRWA from operating in Israel, including in east Jerusalem, and another prohibiting any Israeli state or government agency from working with UNRWA or anyone on its behalf.

The legislation has a three-month waiting period before it goes into effect. It is set to go into effect at the end of January.

Israeli Director-General of the Ministry of Foreign Affairs Jacob Blitshtein wrote in the letter released Sunday that Israel will “continue to work with international partners, including other United Nations agencies, to ensure the facilitation of humanitarian aid to civilians in Gaza in a way that does not undermine Israel’s security."

-ABC News' Ellie Kaufman

The Kamal Adwan Hospital in northern Gaza said Israeli artillery fire hit a floor of the hospital, injuring children who were being treated there.

The hospital also said there was heavy bombing overnight on the block where it is located, threatening the nearby Al Yemen al Saeed Hospital.

The hospital director said in a statement on Sunday the glass of the doors and windows of the facility were shattered by the force of the blasts.

The IDF has not commented on the attacks.

The Israel Defense Forces announced Sunday that it carried out a ground raid in Syria "in recent months" and detained a Syrian citizen they allege was working for Iran.

The IDF claimed Ali Soleiman al-Assi was monitoring IDF troops on the border to plan terror attacks.

The raid in Syria is believed to mark the first time Israeli troops have been on the ground in Syria during the recent conflict. Israel has bombed Syria from the air on numerous occasions.

There has been no confirmation or comment from Syria or Iran on the IDF action in Syria.

In a statement Sunday, the IDF said its forces detained an Iranian terror operative in the special operation in Syria.

"During an intelligence-based, special operation in Syrian territory that took place in recent months, soldiers of the Egoz Unit together with field interrogators from Unit 504, led by the 210th Division, detained an Iranian terror network operative in Syria," the IDF said in a statement.

The IDF said al-Assi is a Syrian citizen who lives in the area of Saida in southern Syria.

"His activities included gathering intelligence on IDF troops in the border area for future terror activity of the network," the IDF alleged.

Al-Assi had been under IDF surveillance, Israeli officials said. He was taken to Israel to undergo interrogation, the IDF said.

-ABC News' Dana Savir

The Israel Defense Forces wrote on X Sunday that its warplanes "eliminated" Farouk Amin Alasi, who it said was Hezbollah's commander for the Khiam area in the Nabatieh region of southern Lebanon.

Alasi, the IDF said, "was responsible for the execution of many anti-tank missile and rocket attacks toward Israeli communities" in the north of the country.

The IDF also said it killed Yousef Ahmad Nun, who it said was a company commander in Hezbollah's Radwan Force in the Khiam area and also responsible for cross-border rocket and anti-tank missile fire.