Already facing a humanitarian crisis, Yemenis have been left in the dark over the coronavirus outbreak.
The BBC has gained exclusive access to Taiz, home to a long-running battle in Yemen's civil war.
Yemen’s healthcare system is on the verge of collapse after five years of a devastating war.
Houthi rebels are being blamed for the attack on a graduation ceremony in the town of al-Dhalea.
By Jonathan Marcus
Defence and diplomatic correspondent