Questions over relief effort multiply as it emerges aid officials knew for months of armed groups diverting food

The theft of food aid in Yemen by Houthi rebels might be only the tip of the iceberg, officials believe, as questions multiply over international relief efforts in the famine-ravaged country.

It has emerged that aid officials have been aware for months that armed groups – most prominently Houthi rebels in the capital, Sana’a – have been diverting food aid into the key areas they control, including by manipulating data in malnutrition surveys used by the UN.