Yemeni capital on high alert over warnings of possible attacks , an official says . Seven al Qaeda militants , eight civilians killed in Jaar district , Yemeni security officials say . Clashes between al Qaeda fighters , tribesmen reported in Lowder district . U.S. and Saudi authorities recently foiled an al Qaeda plot based in Yemen to bomb a U.S.-bound airplane . 17 al Qaeda fighters , two security officers reported killed in Lowder district .
Yemeni capital on high alert over warnings of possible attacks , an official says . Seven al Qaeda militants , eight civilians killed in Jaar district , Yemeni security officials say . Clashes between al Qaeda fighters , tribesmen reported in Lowder district . 17 al Qaeda fighters , two security officers reported killed in Lowder district .