Mr. Tyagi, who headed the Air Force between 2005 and 2007, said that changing the specifications of the helicopters was not his decision alone. Mr Tyagi’s lawyer said that in 2003 the Prime Minister’s Office asked the air chief to get involved in the procurement. In a 2005 meeting, the changes in requirements were suggested. While not sharing details, the CBI said the evidence against the former air chief warranted his arrest in the deal which was signed when Congress was in power. They wanted him in custody for 10 days.