BEIRUT — Yemen's Houthi rebels appear to be growing stronger by the day, shifting from conventional weaponry and guerrilla warfare to upgraded weapons and organized tactics. Whether these weapons were created locally, as the Houthis claim, or smuggled from Iran or even purchased on the sprawling black market in the Red Sea region, the Houthis have used them effectively.
As groups that were recently allied against the Houthis are now fighting each other for control of Yemen's temporary capital of Aden in the southwest, the Houthis claim to have used surface-to-air missiles to shoot down US drones in other areas.