Clashes took place between popular committees of Ansarullah movement and armed tribes which support al Islah party in Yemen's western Ma'rib governorate.
The clashes left about 20 people killed and injured from both sides, before another tribes intervened to stop the clashes, local sources said.
Shiite Houthi fighters tightened their grip on Yemen’s capital after seizing control of the presidential palace, threatening to plunge Saudi Arabia’s southern neighbor deeper into sectarian conflict.