http://www.cfr.org/publication/11508/american_muslim_dilemma.html
Eben Kaplan
"Richard A. Falkenrath, New York City’s deputy police commissioner for counterterrorism, recently warned Congress, “The possibility of a ‘homegrown’ terrorist attack against New York City or any other American city is real and is worsening with time” (PDF). He is just one of many experts in recent months to warn about the danger of homegrown terrorism in the United States. In a discussion at a recent CFR symposium, counterterrorism expert R.P. Eddy said America’s next attackers will likely be “a lot closer to the Columbine killers,” than traditional jihadis."