One of the four bodies handed over by Hamas overnight is not that of a known hostage, Israel announced Wednesday, deepening tensions around a fragile truce.

Hamas delivered four coffins to Israel late Tuesday, each thought to contain the remains of Israeli captives held in Gaza. But on Wednesday, the Israel Defense Forces (IDF) disclosed that forensic tests at the National Institute of Forensic Medicine determined that “the fourth body handed over … does not match any of the hostages.” Israel insisted that “Hamas is required to make all necessary efforts to return the deceased hostages.”

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The three other bodies have been confirmed via DNA testing as those of Tamir Nimrodi, Uriel Baruch, and Eitan Levi. Nimrodi,

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