The ceasefire between Hamas and Israel will go into effect in less than 24 hours, Qatar's foreign ministry said on Saturday.

In a post on X, foreign minister Majid al-Ansari said the ceasefire will start at 8:30 am (6:30 GMT) on Sunday, and advised people to exercise caution and wait for directions from officials.

Early Saturday morning, Israel's Cabinet approved the deal for a ceasefire in Gaza that would release dozens of hostages and pause the 15-month war with Hamas, bringing the sides a step closer to ending their deadliest and most destructive fighting ever.

Despite the ceasefire news, sirens sounded across central Israel on Saturday, with the army saying it intercepted projectiles launched from Yemen.

The Iran-backed Houthis have stepped up their missile attacks in recent weeks. The group says the attacks are part of its campaign aimed at pressuring Israel and the West over the war in Gaza.

Under the first phase of ceasefire, 33 hostages are set to be released over the next six weeks, in exchange for hundreds of Palestinians imprisoned by Israel.

The remainder, including male soldiers, are to be released in a second phase that will be negotiated during the first.

Hamas has said it will not release the remaining captives without a lasting ceasefire and a full Israeli withdrawal.

However, key questions remain about the ceasefire, -- the second achieved during the war -- including the names of the 33 hostages who are to be released and who among them is still alive.

Hamas has agreed to free three female hostages on Day 1 of the deal, four on Day 7, and the remaining 26 over the following five weeks.

Palestinian detainees are to be released as well.

Israel's justice ministry has published a list of more than 700 people who are to be freed in the deal's first phase, and said the release will not begin before 4 pm local time on Sunday.

All people on the list are younger or female.

Also during the first phase, Israeli troops are to pull back into a buffer zone about a kilometre wide inside Gaza, along its borders with Israel.

The move will allow displaced Palestinians to return to their homes, including in Gaza City and northern Gaza.

With most of Gaza's population driven into massive, squalid tent camps, Palestinians are desperate to get back to their homes, even though many were destroyed or heavily damaged by Israel's campaign.

The largely-devastated territory is expected to see a surge in humanitarian aid.

Trucks carrying aid lined up on the Egyptian side of the Rafah border crossing into Gaza on Friday.

On Saturday, two Egyptian government ministers arrived in the northern Sinai Peninsula to oversee the preparations for the delivery of aid and to receive the evacuation of wounded patients, the health ministry said.

Hamas triggered the war with its October 7, 2023, cross-border attack into Israel that killed some 1,200 people and left some 250 others captive.

Nearly 100 hostages remain in Gaza.

Israel responded with a devastating offensive that has killed more than 46,000 Palestinians, according to local health officials, who do not distinguish between civilians and militants but say women and children make up more than half the dead.