The agency on Wednesday carried out searches at 17 locations in Delhi, Mumbai, Bangalore, Chennai, Hyderabad and Khammam.
The agency has registered case against IT officials Mittal, Additional Commissioner (exemption) Bangalore TN Prakash, Deputy Commissioner (Investigation) Chennai S Murali Mohan, Commissioner (audit-2) Chennai Vijayalakshmi, Additional Commissioner Mumbai S Pandian, Commissioner (DR) ITAT Mumbai G Lakshmi Baraprasad, Additional Director General (systems-4) Ghaziabad Vikram Gaur and Additional Director (investigation) Mumbai Rajendra Kumar, CBI sources said.
Deputy Commissioner (Exemption) Chennai RV Haroon Prasad is also named in the FIR, they said.
A chartered accountant Sanjay Bhandari and his sons Shreyansh and Divyang are also named as accused in the case, the sources said.
It is alleged that these officials were availing favours including stay, conveyance and flight travel at the expense of the chartered accountant and his sons and helping him in the cases of his clients as quid pro quo.