Houthi forces fought street-by-street battles with local militia in the old center of Aden on Wednesday, as the first boatloads of emergency medical aid reached the south Yemeni port city, which relief workers say faces a humanitarian catastrophe.

Residents saw a dozen bodies strewn on the streets and said several buildings were burnt or demolished by rocket fire. Mosques broadcast appeals for jihad against the Houthis, Iran-allied fighters who have taken over large areas of Yemen.

The Houthi attack in the central Crater neighborhood, backed by tanks and armored vehicles, was at least partially repelled, residents said, and Houthi gunmen had also been driven from some northern neighborhoods. […]