The six Israelis were the last living captives set to be released in the first phase of the cease-fire. The agreement, strained for weeks, has an uncertain future.

Israel says the release of hundreds of Palestinian prisoners is delayed “until the release of the next hostages has been assured, and without the humiliating ceremonies” at handovers of Israeli captives in Gaza.

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.