Even before the first phase is completed, the fragile cease-fire agreement that has paused 15 months of war in Gaza between Israel and Hamas faces increasingly long odds of lasting or even reaching phase two.

The truce will go into effect on Sunday. Hamas will release 33 hostages in waves over six weeks. They’ll include women, children, men over age 50 and sick or wounded people. About 100 hostages remain in Gaza, although about 35 are believed to be dead.

Prime Minister Benjamin Netanyahu’s office said the deal, which includes the release of hostages for Palestinian prisoners, would go into effect on Sunday.