CAIRO — The cease-fire between Hamas and Israel will go into effect Sunday at 8:30 a.m. local time, mediator Qatar announced Saturday, as families of hostages held in Gaza braced for news of loved ones, Palestinians prepared to receive freed detainees, and humanitarian groups rushed to set up a surge of aid.

United Nations Secretary-General Antonio Guterres praised the mediation efforts of Egypt, Qatar, and the United States, while former US President Barack Obama called the agreement a positive step. UK Prime Minister Keir Starmer also welcomed the deal,