The diplomatic breakthrough promised some relief for the over 1.7 million Palestinians who have fled their homes under 48 days of Israeli brutal attacks.

Israel's national security adviser, Tzachi Hanegbi, announced the delay late Wednesday, without providing a reason.

A Palestinian official told AFP Thursday that a delay was due to "last minute" details over "the names of the Israeli captives and the modalities of their release".

The Arab Gulf nation of Qatar, which played a key role in mediating with Hamas, said early Thursday that a new time for the agreement to go into force would be announced “in the coming hours.” It was originally set to begin at 10 a.m. (0800 GMT) Thursday. The U.S. and Egypt also helped negotiate the deal.

Netanyahu says truce won't end war 

The agreement had raised hopes of eventually winding down the Israeli war, now in its seventh week, which has killed at least 14,000 Palestinians, two-thirds of them women and children and has leveled vast swaths of Gaza, fueled a surge of violence in the occupied West Bank, and stirred fears of a wider conflagration across the Middle East.

But Israeli Prime Minister Benjamin Netanyahu told a nationally televised news conference that the war would resume after the truce expires.

“The war is continuing. We will continue it until we achieve all our goals,” Netanyahu said, adding that he had delivered the same message in a phone call to U.S. President Joe Biden.

Washington has provided extensive military and diplomatic support to Israel since the start of the war.

If implemented, the deal temporarily freezes both sides at a tenuous moment.

Israeli troops hold much of northern Gaza and say that much of Hamas' infrastructure remains intact. Israeli forces on Wednesday revealed what they said was a major Hamas hideout in a tunnel beneath Shifa Hospital.

The claims have not been independently verified.

The territory's largest medical center has been at the heart of a fierce Israeli attack and evacuation of patients and refugee, a reckless endangerment of civilians.

Israel meanwhile ordered the full evacuation of the Indonesian Hospital in the north, Dr. Munir al-Boursh, a Health Ministry official inside the facility, told Al-Jazeera television. He said hospital officials were trying to organize buses to evacuate some 200 patients, including older adults and children with burn injuries. Fighting has raged outside the hospital for days, and hundreds of people have already been forcibly displaced to the south.

Israel has threatened to launch wider operations in southern Gaza, where hundreds of thousands of people who fled the north have crammed into overflowing U.N.-run shelters with dwindling food, water and basic supplies.

For Hamas, the cease-fire would provide an opportunity to regroup after weeks of heavy resistance. Hamas leader Yehya Sinwar, who is believed to be alive and in hiding in Gaza, is likely to claim the release of Palestinian prisoners as a major achievement and declare victory if the war ends.

Captives to be freed in stages 

Under the truce deal, 50 captives will be freed in stages, in exchange for the release of what Hamas said would be 150 Palestinian prisoners. Both sides will release women and children first, and Israel said the truce would be extended an extra day for every additional 10 captives freed by Hamas.

The return of captives could lift spirits in Israel, where their plight has gripped the country. Families of the captives have staged mass demonstrations to pressure the government to bring them home.

Qatar said the cease-fire would allow a “larger number of humanitarian convoys and relief aid" to enter Gaza, including fuel, but it gave no details on actual quantities. Israel cut off all fuel imports at the start of the war, causing a territory-wide blackout and leaving homes and hospitals reliant on generators, which have also steadily been forced to shut down.

Netanyahu said the deal includes a provision for the International Committee of the Red Cross to visit the detainees in captivity.

Israel’s Justice Ministry published a list of 300 Palestinians prisoners to be released, mainly teenagers detained over the past year for rock-throwing and other minor offenses.

Israel has a long history of agreeing to lopsided prisoner swaps with resistance groups, and Hamas is expected to demand a large number of high-profile Palestinian prisoners in exchange for the soldiers.

Heavy toll on Gaza

Weeks of Israeli airstrikes in Gaza, followed by a ground invasion, have killed more than 14,000 Palestinians, according to the Health Ministry, some two-thirds of the dead have been identified as women and minors.

The ministry said that as of Nov. 11 it had lost the ability to count the dead because of the collapse of large parts of the health system under Israel's attacks but that the number has risen sharply since then. Some 2,700 people are missing and believed buried under rubble.

Israel says it has killed thousands of Hamas fighters, though it has presented no evidence for its count.

Three-fourths of Gaza's population of 2.3 million have been forcibly displaced by Israel. Many, if not most, will be unable to return home because of the vast damage and the presence of Israeli troops in the north.

The U.N. agency for Palestinian refugees, known as UNRWA, said that more than 1 million Palestinians were seeking shelter in 156 of its facilities in Gaza, where many have been forced by overcrowding to sleep on the streets outside as a cold, rainy winter sets in.

Israel has barred imports to Gaza since the start of the war, except for a trickle of aid entering through Egypt’s Rafah crossing. Humanitarian aid groups operating in Gaza said the truce was too short and the Rafah crossing’s capacity was insufficient to meet urgent needs.