Regional Tax Office (RTO) Lahore, Federal Board of Revenue (FBR) has reportedly booked former Pakistan Sugar Mills Association (PSMA) President Riaz Qadeer Butt for allegedly massive evasion of tax, FBR RTO soures said here on Saturday. The sources said the detected tax evasion scam is being assessed to be the highest in terms of amount involved in the history of RTO Lahore. The sources said that a few arrests have been made while efforts are being made to arrest Riaz Qadeer Butt and other directors nominated in FIR NO.04/2015. Sources said a complaint was made to the Chief Justice High Court that the group, Macca Group of Companies, was involved in tax evasion of Rs one billion and the court directed the FBR to submit a report. The group of companies filed various writ petitions against the department, however, finally the court instructed to the FBR to finalise the report. Sources said on the instructions of chief commissioner Waqar Ahmad Investigation conducted by the FBR RTO Lahore revealed that M/s Macca Sugar Mills PV, M/s Haq Bahu Sugar Mills, and M/s Abdullah Shah Ghazi Sugar Mills (PVT) were allegedly involved in tax fraud through fictitious bank accounts in the name of employees by way of concealment of actual production of sugar. Though accused are still at large, efforts are being made to arrest them, sources concluded.