"I think there is a constant review of threat perceptions and targets, ... and we work on the safeguards adequately. You can be rest assured that adequate precaution is taken wherever there is a threat perception," Minister of State for Defence M M Pallam Raju said when asked if the Government knew about the terrorists' plans and steps taken to secure the institution.

Raju was talking to reporters on the sidelines of a CII organised event in New Delhi.

David Coleman Headley and Tahawwur Hussain Rana, arrested by the FBI for plotting a major terror attack in India at the behest of Pakistan-based LeT have revealed that they were planning to attack the NDC also.

The National Defence College trains selected senior Defence and Civil Services officers in national and international security-related fields and promotes research and understanding of various linked issues.