From the FBI's official press release:
According to court records, Story came to the attention of law enforcement through a confidential source who saw information Story had posted on an Aryan Nation website indicating that Story was preparing to buy an AK-47 and have it modified to become fully automatic. Story allegedly stated that he is planning on ambushing and murdering any law enforcement officer that stops him on the street if and when martial law is enacted in the United States. In addition, Story has allegedly made numerous statements on various white supremacy online forums, using the screen name “Confederate Brother”, where he continually rants about his hatred of minorities, including his desire that President Obama and Attorney General Holder be removed from office with a 30.06.
Court records allege that Story provided a semi-automatic AK-47, along with $120, to undercover law enforcement with the intent that it be modified to become fully automatic. He was arrested this afternoon by members of FBI Washington Field Office’s Joint Terrorism Task Force after allegedly receiving the modified weapon from an undercover agent.
Because Obama Administration officials were allegedly targeted, the Secret Service got involved in the investigation. A search of Stormfront reveals only one post by someone named Confederate Brother way back in 2005; Stormfronters are skeptical that it is the same person. The Aryan Nations Forum is accessible only by registered members. According to the 11-page official complaint, the information was posted on the forum of the now-defunct American National Socialist Party (ANSP), which has since been merged with Aryan Nations. Story was eventually banned from the Aryan Nations forum for discussing illegal activity. Story's also said to have posted on Tightrope and New Saxon.
Note that the snitch saw the postings on the Internet and alerted law enforcement, which then sent an undercover agent to offer Story the opportunity to actually modify a weapon. This is a reminder that one needs to be circumspect about what one posts on the Web. It explains why Stormfront maintains a rigorous moderation program, even if it is executed a bit arbitrarily at times.
According to the Washington Examiner, Story, a Virginia Department of Transportation employee, previously made news in April 2010, when a purportedly anti-Islam decal on his pickup truck went viral online. The decal showed a photograph of the burning World Trade Center towers along with the phrase, "Everything I ever needed to know about Islam I learned on 9/11." After the image garnered attention, he contacted the Washington Post to say the decal wasn't racist. In addition, the Virginia Department of Motor Vehicles rescinded his custom license plate number which read "14CV88."