GAZA/JERUSALEM (Reuters) – Israel and Hamas agreed on Wednesday to a ceasefire in Gaza for at least four days, to let in aid and free at least 50 hostages held by militants in the Palestinian enclave in exchange for at least 150 Palestinians jailed in Israel.

The first truce in a brutal, near seven-week-old war, reached after mediation by Qatar, was hailed around the world as a sign of progress that could ease the suffering of civilians in Israeli-besieged Gaza and bring more Israeli captives home.

Israel said the ceasefire could be extended further if more hostages were freed, and a Palestinian source said as many as 100 hostages in total could be released by the end of the month.

Hamas and allied groups captured around 240 hostages when Islamist gunmen rampaged through southern Israeli towns on October 7. Previously, Hamas had released just four.

The truce was not expected to begin until Thursday morning, and the start time had yet to be officially announced as of Wednesday afternoon.

A statement by Israeli Prime Minister Benjamin Netanyahu’s office on Tuesday night said 50 women and children would be released over four days at a rate of at least 10 daily. Beyond that, the truce could be extended day by day as long as an additional 10 hostages were freed per day.

Israel’s justice ministry published a list of 300 names of Palestinian prisoners who could be freed.

“Israel’s government is committed to return all the hostages home. Tonight, it approved the proposed deal as a first stage to achieving this goal,” said the government statement.

Hamas said the initial 50 hostages would be released in exchange for 150 Palestinian women and children imprisoned in Israel. Hundreds of trucks of humanitarian, medical and fuel supplies would enter Gaza, while Israel would halt all air sorties over southern Gaza and maintain a daily six-hour daytime no-fly window in the north, the enclave’s ruling Islamists said.

Israel has subjected Gaza to siege and relentless bombardment since the Hamas attack, which killed 1,200 people, mostly civilians, according to Israeli tallies. Since then, over 14,000 Gazans have been killed, around 40 percent of them children, according to medical officials in the territory.

Qatar’s chief negotiator in ceasefire talks, Minister of State at the Foreign Ministry Mohammed Al-Khulaifi, told Reuters the truce meant there would be “no attack whatsoever. No military movements, no expansion, nothing.”

Qatar hopes the deal “will be a seed to a bigger agreement and a permanent cease of fire...That’s our intention,” he said.

Pending the start of the truce there was no let-up in fighting. As morning broke, smoke from explosions rose above northern Gaza in live Reuters video from across the border fence.

Riyad al-Maliki, foreign minister in the Palestinian Authority government based in the West Bank, said an entire extended family had been killed on Wednesday in Jabalia on Gaza’s northern edge.

Israel’s military released footage of soldiers shooting in narrow alleyways and said it had carried out air strikes. Its “forces continue to operate within the [Gaza] Strip’s territory to destroy terrorist infrastructure, eliminate terrorists and locate weaponry,” it said.

An Egyptian security source said mediators sought a start time of 10 a.m. on Thursday for the truce, though this was still awaiting confirmation from the Israelis, with Hamas seeking a few hours from the start to begin freeing hostages. A spokesperson for Israel’s Defense Ministry said the truce would likely take hold “sometime tomorrow.”

‘What Truce Can There Be?’

The truce deal is a first small step towards potential peace in the most violent ruction of the 75-year-old Palestinian-Israeli conflict.

“What truce can there be after what happened to us? We are all are dead people,” said Mona, a woman in Gaza whose nieces and nephews were among those killed by an Israeli air strike that hit the home of the Seyam family.

“This will not bring back what we lost, will not heal our hearts or make up for the tears we shed.”

U.S. President Joe Biden was among international leaders who welcomed the deal. Three Americans, including a 3-year-old girl whose parents were killed on October 7, are expected to be among the hostages to be released, a senior U.S. official said.

Saudi Foreign Minister Prince Faisal bin Farhan Al Saud said the agreed expansion of access for humanitarian aid should become permanent: “Whatever humanitarian access now increases as a result of this hostage deal must remain in place and must be built upon.”

UN Secretary-General Antonio Guterres welcomed the agreement as “an important step in the right direction, but much more needs to be done to end the suffering.”

Both Israel and Hamas, however, said the pause in hostilities would not halt their broader missions.

“We are at war and we will continue the war until we achieve all our goals. To destroy Hamas, return all our hostages and ensure that no entity in Gaza can threaten Israel,” Mr. Netanyahu said in a recorded message.

Hamas said in its statement: “As we announce the striking of a truce agreement, we affirm that our fingers remain on the trigger, and our victorious fighters will remain on the look-out to defend our people and defeat the occupation.”