Early alerts don't do a diddly with the utter incompetence of the Indian intelligence agencies.
Where are the preventive efforts and pre-emptive actions BEFORE the bombs find their innocent targets?
The intelligence agencies are now sending folks to study the "trigger" mechanisms.. To do what?: Write a scientific report on how smart the terrorists are, and then pat each other on their own backs for a job well done? Go and tell that to the victims' families!
Pre-emption can be enforced only by massive penetration of these terrorist organizations and interdict and neutralize their plans long BEFORE they wreak havoc. Looks like a tall order to ask Indian intelligence agencies, and a long way to go before they get anywhere near it.