The International Committee of the Red Cross said on Tuesday it will take time to hand over the remains of hostages and detainees killed in the Israel-Hamas War, calling it a "massive challenge" given the difficulties of finding bodies amid Gaza's rubble."That's an even bigger challenge than having the people alive being released. That's a massive challenge," said the ICRC's spokesperson Christian Cardon, adding it could take days or weeks and that there was a possibility they would never be