Israel said the “findings” it received from militants in Gaza were "not linked" to the last two dead hostages held in the Palestinian territory, following forensic tests.
Under the terms of the October ceasefire deal, Hamas had handed over remains described by the Red Cross as those of one of the two deceased hostages.
"Following the completion of the identification process at the National Center of Forensic Medicine, it was determined that the findings brought yesterday (Tuesday) for examination from the Gaza Strip are not linked to any of the fallen hostages," the Office of Israeli Prime Minister Benjamin Netanyahu said.
The remains of 26 of the 28 dead hostages in Gaza have been returned since the US-brokered ceasefire began in October.
The two remaining bodies are of Israeli police officer Ran Gvili and Thai citizen Sudthisak Rinthalak, who were both kidnapped during Hamas's attack on Israel on October 7, 2023.
The Red Cross has acted as an intermediary between militant groups and Israeli authorities throughout the war that followed the attack by Hamas. The organisation has helped with the release of hostages and the handover of remains.
Israel's war on Gaza has killed more than 70,110 Palestinians, health authorities in the enclave said. At least 356 have been killed since the ceasefire came into effect.
Despite the truce, the Israeli military continues to carry out strikes in response to what it has called breaches of the ceasefire. Bodies of people killed earlier in the war have been being recovered from the rubble.
Israel said its strikes are aimed at militants. Both Israel and Hamas have accused the other of breaching the ceasefire. Hamas urged mediators on Saturday to put pressure on Israel to adhere to the truce.
The US blueprint outlining the future of Gaza, which has been devastated by more than two years of conflict, is still in the early stages. The plan involves an international stabilisation force providing security in the enclave, with a transitional authority to be overseen by US President Donald Trump. The path also envisions a possible path to an independent Palestinian state.

