The DHS released a report several months ago warning about the rise of violent extremism. Here's the link to the report: http://ping.fm/zIAcz

UPDATE: By the way, this same report was lambasted by conservatives and Republicans as unnecessarily alarmist and, in some cases especially by RNC Chairman Michael Steele and Rush Limbaugh, characterized the report as an attack on the conservative movement and "anti-Republican."

Damn asshats.