The Minister of Finance and Coordinating Minister for the Economy Dr. Ngozi Okonjo-Iweala has said Nigeria must punish offenders and build institutions if the country wants to win the war against corruption. In an interview, yesterday with CNN Fareed Zakaria on his GPS programme, the former World Bank President said, " No one can fight corruption for Nigerians except Nigerians. Everyone has to be committed from the top to the bottom to fight it"