A special report from the frontline in Yemen

In Yemen, fighting is intensifying around the Yemeni city of Taiz, where government forces are trying to halt a new advance by Houthi fighters closing in on the city. We have a frontline report from the BBC's international investigations correspondent. Also on the programme: investigations continue into a suspected terror plot at an air force base in southern England; and a potential breakthrough in the storage of mRNA vaccines, which could revolutionise rural healthcare.(Photo: A displaced Yemeni woman, Fatma Mohammed Saleh, speaks to the BBC. Credit: Liam Weir/BBC)