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.

A ceasefire in the Israel-Hamas conflict is set to begin, involving a hostage and prisoner exchange. Three Israeli hostages and hundreds of Palestinian prisoners will be released initially. The temporary truce,

A long-awaited ceasefire in the Israel-Hamas war was delayed Sunday after Prime Minister Benjamin Netanyahu said at the last minute that it would not take effect until the Palestinian militant group provided a list of the hostages to be released.