The Hamas announcement that it will delay the next planned release of Israeli hostages from Gaza has threatened a fragile truce that’s seen as having the potential to wind down 16 months of war.

Hamas has threatened to stall the next release of hostages from the Gaza Strip to Israel, accusing the Jewish nation of violating the terms of the ceasefire deal, which was previously agreed upon in January.

The withdrawal from the Netzarim corridor removes one of Israel’s bargaining chips as it moves toward negotiating a full end to the war.