Singh's examination was in connection with a coal scam case relating to allocation of Talabira II block to Hindalco when he was also holding the portfolio of Coal and in pursuance of the court's December 16 order.
CBI in its charge sheet today, largely based on the facts mentioned in its FIR, has kept the investigation against public servants open, indicating that it has failed to conclusively establish their role in allowing the allocation.
CBI named 46-year-old Birla, chairman of Aditya Birla Group, along with Parekh and unknown persons and officials of Hindalco and Coal Ministry in the FIR, the 14th in the multi-crore scandal, for alleged criminal conspiracy and under provisions of the Prevention of Corruption Act.