CBI sources today said the analysis of the file is crucial for the probe as it would help understand the public good cited as the reason for reversing the decision.u00a0

The sources said agency would first scrutinise other files related to the allocation of block and gather material evidence to develop its case based on which it would call prime accused former Coal Secretary P C Parakh and Aditya Birla Group Chairman Kumar Mangalam Birla for questioning.