NEW : Mayor blamed Islamist fighters for blast ; Islamist fighters blame government . NEW : Women part of U.N. mission in which they cleaned streets for food . Mogadishu the site of violence between Ethiopian government and Islamist fighters . 11 ministers resign Saturday , one minister has refused to step down .
NEW : Mayor blames Islamist fighters for blast ; Islamist fighters blame government . NEW : Women part of U.N. program in which they cleaned streets for food . Mogadishu the site of violence between Ethiopian troops and Islamist fighters . 11 ministers resign Saturday , prime minister has refused to step down .