On Monday, Houthi fighters and government forces clashed at a military camp guarding the entrance to Tur al-Bahah district, one of the principal routes into Aden, the sources said. The camp lies roughly 50 km from the provincial capital of Lahj and 80 km from Aden.
The sources said the Houthis opened their assault on government positions in Al-Maqatirah three days earlier and have since overrun the entire district. That mountainous terrain looks down on the road between Taiz and Aden, and government troops were forced to fall back toward Tur al-Bahah. The advance puts strategic positions along that road at risk and, according to the sources, offers the Houthis an opening to get around government forces holding the mountains above the Bab el-Mandeb Strait.
Houthi official Hamid Rizq posted a video he said showed the group's fighters entering Souq al-Rabouh in Maqatirah district. Reuters could not immediately verify the footage. Yemen's information minister did not immediately respond to a request for comment.
Reuters also reported that Taiz, Yemen's third-largest city, has been cut off since early October, after the Houthis severed its main road south to Aden. More than 100,000 people have been displaced, and the city faces shortages of food, fuel and medicine. The current push follows a Houthi campaign launched in September down Yemen's Red Sea coast, which captured ground along the Bab el-Mandeb, a major shipping lane and an export route for Saudi oil bound for Asia.
The Houthis have stepped up their attacks on Saudi Arabia, the Yemeni government's backer. The Saudi-led coalition has answered with intensified strikes on Houthi positions inside Yemen.