Five days ago, we documented the incursion of the Iranian-backed Houthi rebels into the heart of the Yemeni port city of Aden, which has some ~800,000 residents and where holdouts loyal to President Hadi (who fled for Saudi Arabi in the face of the rebel advance) are battling in the streets in a desperate attempt to repel the rebels from the central Crater district where more than 75,000 people reside.