Hamas and Israel reached a deal for a ceasefire in Gaza that mediators said would take effect on Sunday and include a release of hostages held there during 15 months of bloodshed that devastated the Palestinian enclave and inflamed the Middle East.

The complex phased accord outlines a six-week initial ceasefire with the gradual withdrawal of Israeli forces from the Gaza Strip, where tens of thousands have been killed. Hostages taken by militant group Hamas, which controls Gaza, would be freed in exchange for Palestinian prisoners held by Israel.

At a news conference in Doha, Qatari Prime Minister Sheikh Mohammed bin Abdulrahman Al Thani said the ceasefire would take effect on Sunday. Negotiators are working with Israel and Hamas on steps implementing the deal, he said.

"This deal will halt the fighting in Gaza, surge much-needed humanitarian assistance to Palestinian civilians, and reunite the hostages with their families after more than 15 months in captivity," U.S. President Joe Biden said in Washington.

Despite the breakthrough, residents said Israeli airstrikes continued on Wednesday evening in Gaza, where more than 46,000 people have been killed in the conflict, according to local health authorities. Strikes on Gaza City and northern Gaza killed at least 32 people, medics said.

A Palestinian official close to the talks said mediators were trying to get both sides to stop hostilities before the truce starts on Sunday.

Palestinians responded to news of the deal by celebrating in the streets of Gaza, where they have faced severe shortages of food, water, shelter and fuel. In Khan Younis, throngs clogged the streets amid the sounds of horns as they cheered, waved Palestinian flags and danced.

"I am happy. Yes, I am crying, but those are tears of joy," said Ghada, a displaced mother of five.

In Tel Aviv, families of Israeli hostages and their friends rejoiced at the news, saying in a statement they felt "overwhelming joy and relief (about) the agreement to bring our loved ones home."

Israel's acceptance of the deal will not be official until it is approved by the country's security cabinet and government, with votes slated for Thursday, an Israeli official said.

The accord was expected to win approval despite opposition from some hardliners in Israeli Prime Minister Benjamin Netanyahu's coalition government including Finance Minister Bezalel Smotrich, who repeated his condemnation of the agreement on Wednesday.

Netanyahu called Biden and U.S. President-elect Donald Trump to thank them and said he would visit Washington soon, his office said.

In a social media statement announcing the ceasefire, Hamas called the pact "an achievement for our people" and "a turning point."