(Updates death toll) ADEN, June 26 (Reuters) - Six suspected al Qaeda fighters, six soldiers and a civilian woman were killed in a ****** of militant attacks in the eastern Yemeni city of Seiyun on Thursday, local officials said. A suicide bomber drove his explosives-laden car into the entrance of an army base, killing four soldiers in the city in Hadramawt province - a territory with some of the country's dwindling oil reserves. Washington and Gulf countries are worried that further instability in Yemen could allow Al Qaeda in the Arabian Peninsula (AQAP), the Islamist group's regional wing, to consolidate its position and launch attacks overseas. Seiyun's airport only had two scheduled flights on Thursday, one to Yemen's capital Sanaa and the other to Jeddah in Saudi Arabia, according to flightstats.com.