Troops airlifted from capital Sana ' a amid deteriorating security situation . US evacuated its own remaining personnel on Saturday , official confirmed . Police troopers used tear gas to disperse anti-Houthi protesters in Iran . Southwestern city was taken over by Taiz-backed Houthi rebels on Sunday . Northern group continues to move south after taking capital in September . Country on brink of civil war which may involve neighbouring Saudi Arabia . ISIS affiliates claimed responsibility for deadly bombs at Sana ' a mosques .
Troops airlifted from capital Sana ' a amid deteriorating security situation . US evacuated its own remaining personnel on Saturday , official confirmed . Police troopers used tear gas to disperse anti-Houthi protesters in Taiz . Southwestern city was taken over by Iran-backed Houthi rebels on Sunday . Northern group continues to move south after taking capital in September . Country on brink of civil war which may involve neighbouring Saudi Arabia . ISIS affiliates claimed responsibility for deadly bombs at Sana ' a mosques .