Tatas, Ambanis, Adanis, Birlas contributed an average of Rs 800 crore to Rs 1,000 crore per family group.
'If UAV technology is used by the adversary to target VIPs or strategic targets it would be a different ball game altogether,' says Group Captain Murli Menon (retd).
CBI sources said a case has been registered against UK-based NRI Vipin Khanna, whose named had also figured in another defence deal probed by the agency. They said the kickbacks were allegedly paid in 2009 through subsidiaries of Embraer via a Singapore based company which is owned by the middleman.