A ceasefire in the Gaza war begins on Sunday morning, mediator Qatar said, as Israeli Prime Minister Benjamin Netanyahu vows to bring back "all the hostages" held in the Palestinian territory.

The truce is intended to end more than 15 months of fighting and devastating bombardment, but in a televised address on Saturday evening, the hawkish premier stressed Israel had US support to return to war if necessary.

During an initial 42-day ceasefire, Palestinian militant groups will hand over 33 hostages, three of them on Sunday, and Israel will release hundreds of Palestinian prisoners, some of whom will be deported.

Since mediators Qatar and the United States, which brokered the deal along with Egypt, announced the details on Wednesday, Israeli strikes on Gaza have continued.

On Saturday, Gaza's civil defence rescue agency said at least five members of one family were killed when a strike hit their tent in Khan Yunis, in southern Gaza.

Explosions were heard over Jerusalem as Yemen's Huthi rebels launched a barrage of missiles at Israel in a show of support for the Palestinians ahead of the truce.

The Huthis said they targeted the defence ministry in Tel Aviv and also fired two missiles at the Red Sea port city of Eilat.

Qatari Prime Minister Sheikh Mohammed bin Abdulrahman bin Jassim Al-Thani told Sky News the framework signed this week was the same as one agreed in December 2023, adding it amounted to 13 months of "waste".

The truce is to take effect on the eve of Donald Trump's inauguration for a second term as US president.

Trump told US network NBC on Saturday that he had told Netanyahu that the war "has to end". "We want it to end, but to keep doing what has to be done," he said. (AFP)