The National Accountability Bureau has decided to file a supplementary reference against former president Asif Ali Zardari in money laundering case.
According to sources, the statements of four approvers will be the part of 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, has been 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 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, sources added.