The probe agency sources said number of files related to the 1993-2004 period are missing which is adversely affecting its probe and it needs to be communicated to the Apex Court.

They said although the agency has gathered almost all the files related to its 13 FIRs filed in connection with the alleged irregularities in the coal blocks allocated during 2006-09.

The CBI has registered three preliminary enquiries in connection with coal scam -- related to allocation between 2006-09, between 1993 and 2004 and those done to joint ventures.

The agency has been directed by the Apex Court to file a fresh status report by August 29.

On August 6, the Supreme Court had directed the Centre to provide "full cooperation" to CBI in its probe in coal block allocations scam by providing it with all necessary information and files without any delay.

(Agencies)

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