Rishi, who arrived at the CBI headquarters is being probed by the agency in connection with all terrain vehicles deal with the BEML, CBI sources said.
The sources, without specifying details of documents, said Rishi has visited to provide some records related to the deal which the officials had sought for during last session of examination by them.
CBI officials, who carried out an on-site verification of BEML facilities in Bangalore for the production of Tatra vehicles, had gathered "some crucial" evidence which indicate alleged involvement of some senior officials of the public sector undertaking, sources said.
Rishi has refuted any wrongdoing in the supply of these vehicles.
The agency is probing alleged irregularities in assigning supply from the Czechoslovakia-based Tatra, with which the agreement was originally signed in 1986, to the Tatra-Sipox UK owned by Rishi in 1997 showing it as Original Equipment Manufacturer and the fully-owned subsidiary of the Czech company which was against rules, they said.