United Nations undersecretary-general for humanitarian affairs Stephen O'Brien was prevented by the Houthi rebels from entering Taez city on February 28, 2017. Khaled Abdullah/Reuters
United Nations undersecretary-general for humanitarian affairs Stephen O'Brien was prevented by the Houthi rebels from entering Taez city on February 28, 2017. Khaled Abdullah/Reuters

In setback for humanitarian work, Houthis stop UN aid chief from entering Taez city