Israel's national security adviser Tzachi Hanegbi said in a statement late Wednesday that the hostage release has been delayed until at least Friday.
"The contacts on the release of our hostages are advancing and continuing constantly," Hanegbi said in a statement translated by NBC News. "The start of the release will take place according to the original agreement between the sides, and not before Friday."
Israel and Hamas agreed to a humanitarian pause in Gaza that will last for at least four days.
The deal includes the release of 50 civilian women and children hostages who are currently held in the Palestinian enclave, in exchange for the release of a number of Palestinian women and children detained in Israeli prisons.
U.S. Secretary of State Antony Blinken hailed the deal as "significant progress."
"Today's outcome is the result of tireless diplomacy and relentless effort across the United States government," Blinken said in a post on X, formerly known as Twitter.