The cease-fire between Hamas and Israel will go into effect 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.

Benjamin Netanyahu has warned he reserves the right to restart the war in Gaza with the backing of the United States if he is not satisfied with Hamas’ handling of the ceasefire deal.It came after he said Israel will not proceed with the ceasefire until he receives a list of the 33 hostages who will be released by Hamas in the first phase.

Secretary of State Antony Blinken had said the U.S. wanted a ceasefire deal in Gaza and all remaining captives released before Donald Trump takes office on Jan. 20.