Hundreds of thousands of people in northern Gaza are fleeing in buses, cars and on foot, crowding onto narrow roads leading south after Israel’s evacuation warning. The Israeli military said it is preparing a “wide range” of offensive plans “for the next stages of the war, with an emphasis on significant ground operations,” though it has not provided a concrete indication of when the assault would start. A U.S. evacuation deal to allow American citizens to leave Gaza via the Rafah border into Egypt during a small window on Saturday faltered after Palestinian and Egyptian officials failed to communicate, The Washington Post reported. The humanitarian situation in Gaza is “fast becoming untenable,” U.N. relief head Martin Griffiths warned Saturday, adding that “the worst is yet to come.”