Incidentally, I've yet to find a single report by the NCTC, as mentioned above, that carries the conclusion referred to above. As far as I can tell, the NCTC issues only yearly reports (see their reports). However, it allows you to generate a report for the period concerned via this page, and the resultant table shows that in that period, India did have the second highest death toll. (Not 3674, though, but 3034).
I also found this NCTC report. It's on the incidents of terrorism in 2007, and on page 27 it has a table titled "Deaths by Country in 2007."
According to the table, four countries listed had more than 1000 deaths in 2007: Iraq 13606, Afghanistan 1956, Pakistan 1335, India 1093.