Half the population of war-torn Yemen – 14 million people – are facing “pre-famine conditions”, the UN has warned.
Humanitarian co-ordinator Mark Lowcock said survey work showed the number entirely reliant on aid for survival was three million higher than thought.
There was a clear danger of a famine “much bigger than anything any professional in this field has seen during their working lives”, he added.
Medics say the number of deaths linked to food-related factors is rising.
Yemen has been devastated by a conflict that escalated in 2015, when a Saudi-led coalition intervened after the rebel Houthi movement seized control of much of the west of the country and forced President Abdrabbuh Mansour Hadi to flee abroad.