Israel has delayed an expected release of hundreds of Palestinian prisoners and detainees in exchange for returned Israeli hostages “until further notice,” the Palestinian Prisoners Society said early Sunday.

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.

Among the six hostages freed by Hamas on Saturday in return for Palestinian prisoners were an Israeli Bedouin and an Ethiopian-born man who had been in Gaza for years before the October 7, 2023 attack,