Hamas said on Friday it was investigating a possible error in identifying human remains handed to Israel under a ceasefire deal as Prime Minister Benjamin Netanyahu threatened retaliation for failing to release the body of hostage Shiri Bibas.

Hamas was due to hand over the bodies of Shiri Bibas and her two sons Kfir and Ariel on Thursday along with the remains of a fourth hostage under the ceasefire deal that has halted fighting in Gaza since last month.

Four bodies were delivered and the identities of the Bibas boys and the other hostage, Oded Lifshitz, were confirmed.

But Israeli specialists said the fourth body was that of an unidentified woman and not Bibas, who was kidnapped along with her sons and her husband, Yarden, during the Hamas attack on Israel on October 7, 2023.