The Houthis belong to the Shiite branch of Islam. The Houthi insurgency began in the early 1990s, spurred in part by growing influence of different Sunni branches of Islam.
Saleh had been at the centre of Yemeni politics for four decades.
Yahya Arhab/EPA
Qatar withdrawing its troops has reignited tensions between Eritrea and Djibouti which the UN and African Union are trying to mediate. This comes as Eritrea is also embroiled in the Yemen civil war.