"The disclosure would impede the process of apprehension and prosecution of accused," the investigating agency said in reply to a plea under the Right to Information Act.
CBI said as the criminal case against Quattrocchi was still pending in the trial court and that various other petitions relating to the case were yet to be disposed of in the Delhi High Court and the Supreme Court, the documents and the information can neither be provided nor allowed to be inspected.
The information was sought by a Supreme Court lawyer, Ajay K Agrawal, after the CBI had moved an application before a court in New Delhi to remove all charges against Quattrocchi in the two-decade-old case.
The lawyer, who has opposed closure of case against Quattrocchi in the apex court and trial court, had also sought all information including advices, opinions and notings of law officers as well as CBI's officers who allegedly favoured him.
Ottavio Quattrocchi was named in a CBI chargesheet in 1999 as the conduit for the Bofors bribe and accused of receiving millions of dollars in commission for helping fix the $1.4 billion gun deal.