Two parents and two of their sons were killed in an Israeli airstrike that hit their tent in the Mawasi area near Khan Younis. A relative told an NBC News crew that the family had been celebrating news of the ceasefire agreement days earlier.

Israel and Hamas have agreed to a ceasefire deal, with a pause in fighting in Gaza and the phased release of hostages and Palestinian prisoners expected to begin Sunday. Follow for live updates.

Long-awaited ceasefire between Israel and Hamas is due to begin at 630am GMT on Sunday – but hostages’ families and Palestinians all fear the deal could fall at the final hurdle

The long-awaited ceasefire and hostage release deal between the Israeli government and Hamas will take effect on Sunday, potentially signaling a new chapter in a bloody 15-month conflict that has enflamed the Middle East.

Qatar’s foreign ministry says the ceasefire between Israel and Hamas will go into effect at 8:30 a.m. (0630 GMT) on Sunday

Netanyahu's office said Hamas had "reneged on parts of the agreement reached with the mediators and Israel in an effort to extort last-minute concessions."

Israel's cabinet approved a deal with Palestinian militant group Hamas for a ceasefire and release of hostages in the Gaza Strip, Prime Minister Benjamin Netanyahu's office said on Saturday, a day ahead of the agreement's scheduled start.

The deal is expected to begin Sunday, with the exchange of several hostages held in Gaza for a number of Palestinian prisoners in Israeli jails.

An Israeli airstrike early Saturday killed two parents and their two children, aged 2 and 7, in Gaza’s southern city of Khan Younis, Palestinian health officials said.

The ceasefire as agreed to in Qatar is set to last 42 days. Over that period, 33 hostages are expected to be freed in exchange for hundreds of Palestinian prisoners, there will be a slow withdrawal of the Israeli military from urban centers in Gaza and a surge of humanitarian aid.