mogadishu al shabaab fighters kill least 15 soldier attack military base near somalia capital mogadishu militant group somali officials say friday militants use gun car bomb take control base nearby town barire 50 km 30 miles southwest mogadishu early-morning attack fighters also take 11 pickup truck mount machine gun know technicals say abdiasis abu musab al shabaab military operation spokesman soldier run helter-skelter woods control base village say somali military officer put number dead 15 al shabaab say 21 kill government al shabaab often give differ account death toll battalion soldier fierce fight twin suicide car bomb hand-to-hand fight captain osman ali tell reuters attack soldier somali military special force train u.s. call danab neither amisom foreigners ali add refer african union peacekeeping troop reinforcements send say al shabaab aim topple government mogadishu impose strict interpretation islam somalia war since 1991 clan-based warlords overthrow dictator siad barre turn al qaeda-linked group drive capital 2011 still carry frequent attack security government target african union peacekeeping troop civilians sometimes get catch crossfire ali nur deputy governor low shabelle region barire situate confirm fight local residents first hear two huge blast base heavy exchange gunfire follow look like fight die ali farah tell reuters barire village two weeks ago al shabaab attack army base town near border kenya three weeks ago strike another southern port city kismayu kill total least 43 people two attack militants attack somali military base kill least 15