At least one person was killed and three others wounded in Yemen's northern province of Sa'ada.
Sheikh Saleh Mosfer Moaidh was killed by an armed group in Bakem district when Houthis ambushed him and his bodyguards in Sa'ada province.
Eyewitnesses said that there have been sporadic clashes around the area between Houthis and tribesmen who supported Yemeni government in its war with Houthis at a time the government is busy with the protests around the country.
Yemen has witnessed sporadic battles since 2004 between Yemeni government troops and rebels.