71-year old Tyagi, who retired in 2007, was called for questioning at CBI Headquarters along with his cousin and Chandigarh-based lawyer Gautam Khaitan, who were taken into custody after nearly four hours of grilling, CBI sources said.
These are the first arrests in the case by CBI which came three years after it registered an FIR in 2013 to probe the allegations in the aftermath of the details of the scam emerging in Italy where the prosecutors levelled allegations of corruption in the deal against the chief of Finmeccanica, the parent company of AgustaWestland.
She said such changes in Operational Requirements (ORs) made the private company based at the UK (AgustaWestland), eligble to participate in the Request for Proposal for VVIP Helicopters.
"It was revealed during investigation that such undue favours were allegedly shown to said UK-based private company by accepting illegal gratification from the accused vendors through middlemen/relatives including his cousin and an advocate etc. Who accepted the illegal gratification for exercising influence through illegal means, or using personal influence over the concerned public servants," CBI Spokepserson said.
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In media interviews during the last three years, Tyagi and his cousin had strongly denied having taken any bribes to influence the deal.
Rejecting the allegations, Air Chief Marshal Tyagi had said the change of specifications, which brought AgustaWestland into contention, was a collective decision in which senior officers of Indian Air Force, SPG and other departments were involved.
CBI sources said the bribe amount was routed through
middlemen and relatives to exert influence over Tyagi.
CBI alleged that in 2005, Tyagi had agreed to change the long held stand of the Indian Air Force that minimum operational ceiling of the VVIP helicopters should be 6000 metres.
On January 1, 2014, India had scrapped the contract with Finmeccanica's British subsidiary AgustaWestland for supplying 12 AW-101 VVIP choppers to the IAF over alleged breach of contractual obligations and charges of payment of kickbacks of Rs 450 crore by it for securing the deal.
The CBI had registered a case against Tyagi along with 18 others, including his cousins, European middlemen and companies.
The CBI had sent judicial requests to eight countries - Italy, the United Kingdom, British Virgin Island, Tunisia, Switzerland, Singapore, the UAE and Mauritius to get details of money trail of the kickbacks which landed on the Indian shores allegedly in the form of off-set contracts to IDS, Chandigarh, Praveen Bakshi, one of the accused.