India, Nov. 13 -- The Red Fort blast in Delhi on November 10 has jolted India's intelligence and security circles - not just for its deadly impact, but for the unexpected profile of those allegedly involved. The explosion, which tore through the vicinity of one of the nation's most protected heritage sites, claimed at least 13 lives and left dozens injured.

In a chilling new trend, the investigation has revealed a terror module composed not of battle-hardened militants from the mountains of Kashmir or the border zones of Punjab, but of doctors and medical professionals - individuals from educated, urban, "white-collar" backgrounds.

This evolving face of terrorism - radicalised professionals using intellect and access rather than guerril...