Forces loyal to exiled President Abdu Rabu Mansour Hadi, as well as southern rebels loosely aligned with him, have benefited from the arrival of troops and supplies from the Saudi Arabian-led coalition of nations supporting Hadi.
As the Houthi fighters, along with renegade military units loyal to Yemen's former president Ali Abdullah Saleh, have retreated, they are accused of leaving a deadly trail of mines, improvised explosive devices and booby traps in their wake.