Libyan tribes have asked Egypt to provide weapons for defence for the Tobruk-based army.
Yemen's Houthi armed group has fought local Sunni tribes since last September.
Clashes erupted early in the day between armed tribesmen from the Murad tribe and Houthis in Yemen's Maarib district. 6 Houthis were killed.
According to sources, tribesmen took control of the four military sites in the Yemen's Dhi Naim district
Army forces loyal to the Tripoli-based government and armed tribesmen have reached a cease-fire in southern Libya.