WASHINGTON — A ceasefire deal has been reached to end 15 months of fighting in the Gaza Strip, Hamas and Israeli officials and a source briefed on the negotiations told NBC News on Wednesday.

The hard-won agreement will also free dozens of hostages held in Gaza, as well as Palestinianis in Israeli jails, bringing the first real break in violence since a weeklong truce expired Dec. 1, 2023.

The new follows weeks of talks brokered by the United States, Qatar and Egypt, amid a brutal winter for civilians in Gaza, as well as dramatic developments across the Middle East that have dealt setbacks to Iran, an Israeli foe.

Israel and Hamas have not officially announced a deal, although senior Hamas official Basem Naim confirmed to NBC News the militant group had agreed to it.

“We are very happy to reach a deal today to stop the aggression against our people, but unfortunately we were able to reach the same deal last May,” Naim said.

Another source with direct knowledge of the talks and an Israeli official briefed on the deal also confirmed the news.

President Joe Biden was expected to make a statement on the agreement later Wednesday.

Gil Dickmann, cousin of deceased hostage Carmel Gat, told NBC News that it was “very exciting” to see that finally hostages were going to be returned.

“It’s also really sad to know that Carmel could have and should have been among them but a deal didn’t come in time and she was murdered in captivity,” he said.

Earlier, a diplomatic source in Washington told NBC News that Israeli Prime Minister Benjamin Netanyahu was preparing to meet with his security Cabinet, where approval of the deal was expected quickly. He would then take the pact to the full Cabinet, which is also expected to approve. 

Israel’s Supreme Court would have 24 hours to permit an appeal, so the earliest a ceasefire could go into effect would be Friday, the source said. The first group of hostages would come out Sunday, the person added.

Israel launched its military campaign in the Palestinian enclave after Hamas’ Oct. 7 terrorist attack, in which it says 1,200 people were killed and 250 taken hostage. Just more than 100 were released in late November 2023 during a pause in hostilities, in exchange for 240 Palestinian prisoners.

The war has shattered Gaza’s infrastructure and displaced most of its population. Health officials in the enclave say more than 46,000 Palestinians have been killed by Israeli forces — most of them civilians.