AL-MUKALLA: Unidentified gunmen assassinated a tribal chief in Houthi-held Sanaa on Sunday evening, in what appears to be the latest in a series of drive-by shootings and assaults. Nasser Abdullah Tamah Al-Kumaim, a tribal leader and businessman from the province of Thamar, was reportedly gunned down outside his home by attackers who fled the scene, according to local media