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.
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