The situation in the northern Gaza Strip is “apocalyptic” as Israel pursues a military offensive in the area, top United Nations officials warned on Friday. “The entire Palestinian population in North Gaza is at imminent risk of dying from disease, famine and violence,” they said in a statement signed by the acting U.N. aid chief Joyce Msuya, heads of U.N. agencies, including U.N. children’s agency UNICEF and the World Food Programme, and other aid groups. Israel began a wide military push in northern Gaza last month and has killed hundreds so far. The United States has said it was watching to…