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 postpone the next hostage release scheduled to take place in Gaza on Saturday “until further notice,” accusing Israel of breaking the ceasefire deal.

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.