An armed group suspected of being al-Qaeda members killed six soldiers in the northern Yemen province of al-Baidha on Saturday, the official September 26 news website reported.
The group of more than 20 travelling in two pick-up trucks attacked the Lamasan military post in Radaa city and fired on the soldiers stationed there before escaping, city security chief Amer al-Shaibary said.
The gunmen also threw hand-grenades, he told the website put out by the Ministry of Defence, dpa reported.
In a separate incident on Saturday, at least 15 anti-government protesters were injured in the southern city of Taiz when masked men and rooftop snipers fired on demonstrators with live ammunition, witnesses told the German Press Agency dpa.
Yemenis in the southern cities continued their civil disobedience to pressure President Ali Abdullah Saleh to resign.
Saleh, president for 32 years, has refused to quit, despite the unrest that has gripped the country for almost four months.
Saleh, a key ally of the United States, has recently backtracked on accepting a Gulf-brokered deal for a transition of power and remains defiant despite calls from neighbouring Gulf states and the European Union.
Protests erupted in Yemen in January and grew more strident in February after the fall of Egyptian leader Hosny Mubarak. The death toll has since exceeded 150, according to rights groups.