DEIR AL-BALAH, Gaza Strip — A four-day cease-fire in Gaza between Israel and Hamas was set to begin this morning, Qatar said after a daylong delay extended the agony for those hoping for some relief from the deal, which is to bring the release of dozens of hostages held by militants and Palestinians imprisoned by Israel.

The diplomatic breakthrough promised some relief for the 2.3 million Palestinians in Gaza who have endured weeks of Israeli bombardment, as well as families in Israel fearful for the fate of their loved ones taken captive during Hamas’ Oct. 7 attack that triggered the war.

The cease-fire was originally set to begin Thursday morning, but it appeared to hit a snag the night before when Israel’s national security adviser, Tzachi Hanegbi, announced a one-day delay without providing a reason.

On Thursday, Qatari Foreign Ministry spokesman Majed al-Ansari announced the cease-fire will start at 7 a.m. local time Friday (5 a.m. GMT.)

He said the two sides had exchanged lists of those to be released, and the first group of 13 women and children held by Hamas would be freed Friday afternoon. He did not say how many Palestinian prisoners would be freed, but officials have said three would be freed for every hostage.

Increased aid for Palestinians will start to enter Gaza “as soon as possible,” al-Ansari said. The hope is that the “momentum” from this deal will lead to an “end to this violence,” he told reporters.

Israeli airstrikes continued Thursday. In the afternoon, a strike leveled a residential building in the Nuseirat refugee camp in central Gaza. At least 12 people were killed, according to officials at nearby Al-Aqsa Hospital.

One resident, Hosni Moharib, said his wife and several children were killed and other relatives remained buried under the rubble.

“It exploded on the house, striking the babies and young children. Everyone in the house, they are all dead,” he said, bursting into tears.

The Israeli bombardment, now in its seventh week, has killed more than 13,300 Palestinians, according to the Health Ministry in Hamas-ruled Gaza, which resumed its detailed count of casualties in Gaza from the war. The ministry had stopped publishing casualty counts since Nov. 11, saying it had lost the ability to do so because of the health system’s collapse in the north,

The new numbers were not fully broken down, but women and minors have consistently made up around two-thirds of the dead. The figures do not include updated numbers from hospitals in the north. The ministry says some 6,000 people have been reported missing, feared buried under rubble.