No official reason has been offered yet as to why Barrett was arrested. But it may be connected to a YouTube video Barrett released yesterday in which he appears to threaten an FBI agent named Robert Smith. In the rambling 13-minute expletive-laced video, Barrett accuses Smith of getting his mother into trouble on obstruction of justice charges over a laptop that Barrett had attempted to conceal from authorities. The video is entitled: "Why I'm Going to Destroy FBI Agent Robert Smith Part Three: Revenge of the Lithe."

This is the YouTube video released by Anonymous spokesman Barrett Brown.

At one point in the video, Barrett warns about agent Smith's life being over. "When I say his life is over, I'm not saying I'm going to kill him, but I am going to ruin his life and look into his f.... kids," Brown says in the video.

At another point in the video, Barrett expresses concern over being targeted by the Zeta drug cartel of Mexico and claims he is armed and ready to fight people who might looking to kill him. "Any armed officials of the U.S. government, particularly the FBI, will be regarded as a potential Zeta assassin squad," Brown says. "The FBI knows that I am armed, that I come from a military family, that I was taught to shoot by a Vietnam vet."

Brown concludes the video on a dramatic note. "It was pretty obvious that I was going to be dead by 40 years or so. I wouldn't mind going out with two FBI side arms and a f...Egyptian Pharoah."