Sounding a note of caution, Pillai said terrorists tend to pick new targets. "This time the attack may be quite different. It could be major schools, malls. We have to be prepared for that," he emphasised.
On the option of targeting terror training camps on foreign soil, Pillai said that will have to be a policy decision.
Former Intelligence Bureau director Arun Bhagat said while India's security system has improved, intelligence gathering and processing remain a formidable challenge.
"Local police should be involved more," Bhagat told IANS.