The whole India is a safe heaven for terrorists. Now that Paks are trying fight them, these guys have reservations, red carpets etc. One technique is use Tamilnadu as base, commit no terror acts in Tamilnadu and commit the acts learnt in Tamilnadu in other states. Like the idiots of all time, we can think that the states where the acts of terror occured as the corridors and real culprit govts of the states can get away.