Hamas on Sunday threatened to kill all of its remaining hostages if demands such as more aid for Gaza and prisoner exchanges were not met, after suffering repeated losses in its battle with Israel. The Palestinian terror group is still holding the bodies of 20 hostages who died in captivity, Israel said over the weekend. Abu Obeida, a spokesman for Hamas’ armed wing, claimed Sunday that not another single kidnap victim will leave Gaza alive unless Israel agrees to all its demands in negotiations that broke down at the start of December. At least some of those demands have been...