CBI sources said the defence ministry has provided them with a new set of documents related to the deal but declined to give details.
They said agency is planning to start the examination of suspects from next week.
The sources said agency had asked the Defence Ministry to provide files related to changes made in the helicopters' parameter which suited Italian company Finmeccanica and its subsidiary supplier AgustaWestland.
An agency team is in touch with the Defence Ministry officials who have been asked to produce these files at the earliest, they said.
The agency has registered a preliminary enquiry (PE) against 11 people including former IAF chief S P Tyagi, his three cousins, European middlemen and four companies.
All the suspects have refuted the allegations.
The sources said during PE, the agency's powers in summoning and carrying out searches are very limited and it is trying to complete the enquiry as early as possible.
In its PE, CBI mentioned allegations that in the procurement process of the helicopters, some middlemen have influenced the deal in favour of UK-based AgustaWestland.
It is also alleged that the Italian company paid commission of several millions of Euros to the middlemen who allegedly passed on a share to several Indian nationals through Tunisia and Mauritius route in the garb of engineering contracts with two India-based companies, the PE said.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
)