When asked if Headley has links to the Mumbai attacks of 26/11, Pillai told rediff.com in a telephone conversation from New Delhi that it was too early to comment on this issue.
"Our agencies are probing the matter," the home secretary said, "and we will get more details soon."
He said a decision on whether to seek Headley's extradition from the US to India would be taken once the team of Intelligence Bureau and Research and Analysis Wing agents return to India.
The FBI has provided access to agents from India's domestic and external intelligence agencies to the information it has gathered on Headley and his associate Tahawwur Husain Rana, who is also in the FBI's custody.
Investigations reveal that Headley -- who was known as Daood Gilani till he changed his name -- has visited India several times. Sources in India's security agencies told this correspondent that Lashkar founder Mohammad Sayeed kept in regular touch with Headley and convinced him to focus on India and drop plans the American national had to attack an editor and cartoonist at the Danish newspaper which published cartoons on Prophet Mohammad two years ago.
Sources in the Intelligence Bureau told rediff.com that Headley is suspected of planning strikes on Indian schools and targeting Bollywood stars.
The IB sources say the plot to attack schools in India was devised during an exchange of e-mail between Headley, Rana and their Lashkar minders in Pakistan. The sources point out that specific intelligence about Lashkar's plans to target Indian schools was passed on to security agencies at least three months ago.
Recent intelligence gathered by Indian intelligence agencies reveal that several terrorists are being trained in Pakistan occupied Kashmir for attacks in India.
During his reconnissance of targets in India, Headley was asked by his Lashkar minders to establish contacts with Indians who could assist his murderous missions. Indian security agencies are now trying to locate the sleeper cells who would have played a part in such attacks.
IB sources say sleeper cells in south India are being closely monitored since intelligence inputs suggest that Lashkar leaders have specifically asked sleeper cells in the south to be roused for future operations.
