90 Palestinian prisoners released from Israel

Hamas affirmed "our commitment to implementing the terms of the agreement," in a Sunday statement shortly after the ceasefire with Israel came into effect.

Hamas added that "all efforts will be made" to increase aid and return services in Gaza to "normal."

Referring to the planned exchange of hostages taken from Israel for Palestinian prisoners, the group said its "heroic prisoners have a date with freedom starting today."

Hamas also addressed the "heroic and steadfast people in Gaza" and said the world should "stand in honor of the legendary steadfastness of our people in Gaza, and in appreciation of their patience and sacrifices over the course of 471 days."

-ABC News' Samy Zyara

The United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) said Sunday it has 4,000 truckloads of aid ready to enter Gaza during the nascent ceasefire.

Half of the truckloads prepared for entry carry food and flour, UNRWA said in a post to X shortly after the ceasefire came into effect.

UNRWA Commissioner-General Philippe Lazzarini said last week that Gaza needs "rapid, unhindered and uninterrupted humanitarian access and supplies" to meet the "tremendous suffering caused by this war."

Israel's parliament passed legislation in October banning UNRWA from operating on Israeli-controlled territory, accusing the organization of having been compromised by Hamas and other Palestinian militant groups.

UNRWA denied the accusation and warned that relief efforts in Gaza and the West Bank will be crippled by the ban.

-ABC News' Jordana Miller

Israel's National Security Minister Itamar Ben-Gvir announced Sunday that he and his fellow Otzma Yehudit -- meaning Jewish Power -- party members had resigned from Prime Minister Benjamin Netanyahu's coalition government in protest of the Gaza ceasefire deal.

"We will not agree to a reckless deal," Ben-Gvir wrote on X. "My friends in Otzma Yehudit and I submitted our resignation letters from the government and the coalition this morning."

The resignations mean Netanyahu's coalition loses the backing of six Otzma Yehudit seats in the Israeli parliament -- the Knesset. The prime minister's ruling coalition now has a diminished majority of 62 of the body's 120 seats.

-ABC News' Jordana Miller

The first group of hostages to be freed from Gaza as part of Sunday’s ceasefire plan will be released at 4 p.m. local time -- 11 a.m. ET -- according to Israeli Prime Minister Benjamin Netanyahu’s office.

The Directorate of Abductees, Returnees and Missing Persons in the prime minister’s office said in a statement that the “families of the abductees have been updated with the list of abductees who will be released today in the first phase of the plan.”

Four more living hostages are scheduled to be released in seven days, the directorate said.

“The families will be updated with the names of those being released 24 hours before this date," the directorate said.

-ABC News’ Jordana Miller