The Economic and Financial Crimes Commission (EFCC) has arrested a former Chief Financial Officer (CFO) of NNPC Limited (NNPCL), Umar Isa, over an alleged $7.2 billion fraud connected to the rehabilitation of the Kaduna, Warri and Port Harcourt refineries. Also in the custody of the EFCC is a former Managing Director of Warri Refinery, Jimoh Olasunkanmi. As CFO, Isa was …