Agusta Westland scam: Subramanian Swamy writes to CBI, says Ratan Tata, ex-Defence Secy Vijay Singh must be questioned

Firebrand BJP Rajya Sabha MP Subramanian Swamy has written a letter to the CBI urging it to probe the role of former defence secretary Vijay Singh and Tata Sons interim chairman Ratan Tata in connection with the Agusta Westland chopper scam case.