According to reports, FBI sleuths, while in India, would probe Headley's Indian network and also establish his links with the LeT.
The FBI's visit comes when the Government issued an advisory suggesting that five Indian cities, Delhi, Mumbai, Lucknow, Agra and Ahmedabad, are on the terror radar just before 26/11 anniversary.
Incidentally, these are the very cities which were visited by Headley during his multiple trips to the country.
Headley and his Pakistani co-conspirator Tahawwur Hussain Rana were arrested for the foiled terror plot to attack India and Denmark.
The FBI believes that both were operatives of the banned Pak-based terror group Lashkar-e-Toiba (LeT).