A Reuters story on Yahoo News describes Sunni forces loyal to displaced-if-not-deposed President Hadi fighting back against Shia Houthi forces in the 100 miles between Sanaa and Aden. As noted earlier, Yemen has become a new front in the holy war between Sunni and Shia Muslims.
Yemen may descend into the Hobbesian state of nature which characterized nearby Somalia for years. Regional sponsors provide support to local warlords - Shia Iran backs the Houthis while the Sunni Gulf States and Saudis back Hadi.