In Yemen, more than 6,000 people have been killed since March when a coalition led by Saudi Arabia launched a military campaign against Houthi rebels. Already the poorest country in the Arab world, at least 80% of the population is now dependent on food aid. In this exclusive report, BBC Arabic's Safa Al Ahmad has travelled to the besieged Yemeni city of Taiz.

(Photo: Soldiers loyal to Yemen"s government in Taiz in December 2015. Credit: Reuters)