Israel will delay Saturday’s expected release of hundreds of Palestinian prisoners “until the release of the next hostages is guaranteed, and without the degrading ceremonies,” according to a statement from the Israeli Prime Minister’s Office.

In what was set to be the largest swap under January’s ceasefire agreement, six hostages were freed, but the release of some 600 Palestinian prisoners was delayed. It comes after Shiri Bibas’s body was returned by Hamas.

Hamas on Sunday said Israel has gravely endangered a five-week-old Gaza truce by delaying the release of Palestinian prisoners under the deal because of the manner it has freed Israeli hostages.The first phase of the truce ends early in March and details of a planned subsequent phase have not been agreed.