The term ‘lone wolf’ is generally used to describe a terrorist apparently acting on his own, self-motivated, and with few if any links with the outside world. The term has caught the public imagination, with its overtones of a solitary wolf, hunting its prey in the darkness of the night.  The reality however, is somewhat different. Most terrorists tend to talk, and talk a lot. A study by the University of Pennsylvania found that in at least 83 percent of cases, others were aware of the grievances that spurred the terrorist to action. Even more surprisingly, in 64 percent of cases, family or friends were actually aware of the individual’s intent to engage in terrorism-related activity.

Source: http://www.firstpost.com/india/rajnath-singhs-call-for-special-anti-terror-cell-focus-must-be-on-diy-terrorists-rather-than-lone-wolves-4296149.html