The first phase of the ceasefire that paused 15 months of brutal warfare between Israel and Hamas militants is set to end on Saturday — and it's unclear what comes next.

The two sides were supposed to start negotiating a second phase weeks ago in which Hamas would release all the remaining hostages from its Oct. 7, 2023, attack, which triggered the war, in exchange for more Palestinian prisoners, a lasting ceasefire and a full Israeli withdrawal from the Gaza Strip.