New Delhi: Alleging there was a "criminal nexus" between Uttar Pradesh Chief Minister Mayawati and her relatives, CBI on Tuesday told the Supreme Court that the disproportionate assets case against her cannot be closed on the basis of conclusions arrived by the Income Tax department.

In a fresh affidavit submitted before the apex court, CBI rejected Mayawati’s stand that the DA case should come to an end after the income tax authorities had accepted her income tax assessments.

The agency said, "The investigation against the petitioner is based on cogent evidence available in the form of documentary and oral evidence which show that there is a criminal nexus between income of the relatives and the petitioner as well as between Mayawati and her donors and relatives."

Mayawati had earlier on the basis of a clean chit given by the Income Tax Appellate Tribunal filed an application in the apex court to quash the case registered by CBI against her for owning various moveable and immovable assets far exceeding her known sources of income.

CBI told the court that it would soon file the charge sheet against Mayawati before the CBI Judge in the Lucknow court and maintained the scope of criminal proceedings were different from civil proceedings including the immunity granted by the IT department.

The agency, however, said the orders of the IT Commissioner granting immunity would be duly taken into account insofar as they were applicable to the DA case against her while filing the final report before the CBI court.

Rejecting Mayawati’claims, CBI said, "the findings of the Income tax authorities are relevant and material only for taxation purposes and cannot have any bearing on the material evidence collected during a criminal investigation.