Americans who turn to terrorism and plot against the U.S. are now as big a concern as international terrorists, Homeland Security Secretary Janet Napolitano said Sunday.
The government is just starting to confront this reality and does not have a good handle on how to prevent someone from becoming a violent extremist, she said.
In the last year, Napolitano said, she's witnessed a movement from international extremism to domestic extremism — cases in which Americans radicalized and decided to plot attacks against the country.
http://news.yahoo.com/s/ap/20100221/ap_on_go_ca_st_pe/us_napolitano_governors