The United Nations says two thirds of the 2.3 million people in Gaza are now homeless. Speaking today UN Secretary General Antonio Guterres said the world is witnessing an unparalleled and unprecedented level of civilian death compared to any other conflict in his more than six years in office. He also expressed deep shock that two UN-run schools were hit in Gaza in less than 24 hours, killing and injuring dozens of people. Our correspondent at the UN, William Denselow, spoke to Charlotte Cook about what the Secretary General had to say.