Fierce clashes broke out Saturday between pro-government tribesmen and Shiite Houthi rebels near the Yemeni capital, as the president vowed that authorities will not tolerate any violence.

The Houthis — also known as Ansarullah — have advanced out of their northern mountain strongholds towards the capital in a suspected attempt to expand their sphere of influence as Yemen is reorganized into six regions.

Clashes using machine guns and medium weapons raged in the villages of Darwan, Bani Maymun, Al-Jaef and Al-Maamar, in the northern town of Hamdan, around 10 kilometers (six miles) from Sanaa International Airport, tribal and army sources said. […]