CBI sources told PTI that 21 persons have been named in the FIR filed before the designated court here, but declined to elaborate.

Last month, CBI had filed a FIR against Obulapuram Mining Company owned by Reddy whose wife, Aruna Lakshmi, owns AMC.

Reddy along with OMC Managing Director B V Srinivasa Reddy are in judicial custody at Chanchalguda jail in Hyderabad following their arrest by CBI in connection with illegal mining on August 4.

CBI is carrying out a probe into illegal mining in parts of Karnataka since September as per a Supreme Court directive.