We have seen an increase in the lone wolf type attacks, which, from a law enforcement and investigation perspective, are the most challenging. Why? Because by definition they’re not conspiring.
Homeland Security Secretary Janet Napolitano • Discussing “lone wolf” attacks like the ones by John Patrick Bedell (who shot two Pentagon security guards last week), Joe Stack (who flew a plane into an IRS building in February) and Johnny Lee Wicks (who was killed in a January courthouse attack after losing a case regarding his Social Security benefits). For those playing at home, that’s three “lone wolf” attacks in three months, which is problematic for law enforcement, because it’s not easy to prevent such cases. source