GENEVA: The UN aid chief warned on Thursday (May 16) that famine was an immediate risk in Gaza with food stocks running out, describing fresh challenges since the start of Israel's Rafah operation that made planning and distributing relief almost impossible. As Israel has pounded southern Gaza , some 600,000 people or about half of the uprooted population sheltering there have fled to other areas of the besieged enclave, sometimes returning to bombed-out houses or empty fields. Martin Griffiths