NEW : Mayor blamed Islamist fighters for blast ; Islamist fighters blame government . NEW : The victims were participating in a program that allows Somali women to work as street cleaners in exchange for food . 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 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 .