The Nigerian Centre for Anti-Corruption and Open Leadership, CACOL, has called on anti-corruption agencies to immediately commence necessary investigation of former governor of Zamfara State, Alhaji Abdulaziz Abubakar Yari for alleged unlawful diversion of a whooping sum of N37.4 billion naira, being a refund from the federal government for the funds used by the former administration in the reconstruction and rehabilitation of 14 federal roads in the state.