Defence Minister AK Antony has admitted that bribes were paid in the AugustaWestland chopper deal case and assured that those who took the kickbacks would be brought to book.
"Some body has taken money," said Antony referring to purchase of choppers from the Anglo-Italian helicopter company owned by Italy´s Finmeccanica.
Antony said: "Investigation is at crucial stage. We will not show mercy to anybody."
The Central Bureau of Investigation (CBI) probing the case earlier this month registered a First Information Report (FIR) against 12 people, including former Air Force chief SP Tyagi.
SP Tyagi´s cousins, Julie Tyagi and Dosca Tyagi, and four firms have been named in the FIR.
British Prime Minister David Cameron had assured Indian Prime Minister Manmohan Singh cooperation in the AugustaWestland chopper scandal.
Both Singh and Cameron discussed the issue during their meeting in New Delhi on Feb 19.
The Indian PM said he conveyed to Cameron the very serious concerns regarding allegations about unethical means used in securing the 2010 contract for Agusta Westland helicopters.
The Italian prosecutors, who named SP Tyagi as a part of the alleged payment of kickbacks in the Rs 3600 crore purchase deal of VVIP choppers by India from AugustaWestland, earlier said they have enough evidence against Tyagi for framing the charges.
There are allegations of kickbacks worth 50 million euros in the scam, according to media reports.