NEW : Al-Shabaab claims responsibility ; says slain official worked with 'foreign ' spies . NEW : U.S. officials say they are investigating the claim of a link between the attack and al Qaeda in Somalia. 8 people injured are treated at a Mogadishu hospital . In a separate bombing , a lawmaker 's car explodes but The slain official , Abdikafi Holowle Osman , was a former Benadir regional administrative secretary and an active campaigner against Al-Shabaab . he is unhurt . Al-Shabaab 's mission includes turning Somalia into a fundamentalist Islamic state .
NEW : Al-Shabaab claims responsibility ; says slain official worked with 'foreign ' spies . NEW : U.S. officials say they are investigating the claim of a link between the attack and al Qaeda in Somalia. 8 people injured are treated at a Mogadishu hospital . In a separate bombing , a lawmaker 's car explodes but he is unhurt . Al-Shabaab 's mission includes turning Somalia into a fundamentalist Islamic state .