A top UN official on Sunday accused Israel of continuing to deny the United Nations humanitarian access in the Gaza Strip, where the UN food chief warned a “full-blown famine” has taken hold in the north of the enclave of 2.3 million people. While not a formal famine declaration, World Food Programme Executive Director Cindy McCain said – in an NBC News interview broadcast on Sunday – that based on the “horror” on the ground: “There is famine, full-blown famine, in the north, and it’s moving its way south.” Israel has continued to enhance its efforts to boost aid to Gaza, said COGAT, an Israel…