The National Accountability Bureau (NAB) has decided to file a supplementary reference against former president Asif Ali Zardari in the money laundering case. According to sources, the statements of four approvers will be the part of the supplementary reference against Zardari. Aslam Masood, the chief financial officer of the Omni Group of Companies who was arrested in October last year in London by the Interpol and brought to Pakistan, is one of the four approvers in the case. Masood was allegedly a key person behind the scheme to move illicit funds through fake accounts. Other three approvers, Kiran Aman, Naureen Sultan and Adeel Shah Rashdi are officers of a private bank, NAB sources said. The investigation team of the Federal Investigation Agency (FIA) has also joined the probe being conducted by the NAB, sources said. Investigation officer Muhammad Ali Abro has been taken on deputation and added to the NAB investigation team. Former president Asif Ali Zardari, his sister Faryal Talpur and other accused are facing an inquiry into the money laundering scam involving billions laundered through fake bank accounts. Zardari’s close aides Hussain Lawai and Anwar Majeed are also being investigated in the scandal. They both are in custody. A joint investigation team (JIT) formed to probe the mega money laundering scandal has submitted its report in the Supreme Court. The report revealed that 29 fake bank accounts have been initially identified which were used for money laundering.