Seemingly by an anarchist group called F.E.A.R.
Although details are still sketchy, it seems unlikely that they were anarchists as one of the leaders of this group was a page at the Republican Party 2008 convention.
I would suspect the issue of the US military letting in the dregs of the Far Right is nearer the mark. They relaxed their selection criteria after the invasion of Iraq and subsequent recruitment problems, as the SPLC pointed out in 2006:
“Ten years after Pentagon leaders toughened policies on extremist activities by active duty personnel — a move that came in the wake of the Oklahoma City bombing by decorated Gulf War combat veteran Timothy McVeigh and the murder of a black couple by members of a skinhead gang in the elite 82nd Airborne Division — large numbers of neo-Nazis and skinhead extremists continue to infiltrate the ranks of the world’s best-trained, best-equipped fighting force. Military recruiters and base commanders, under intense pressure from the war in Iraq to fill the ranks, often look the other way.
Neo-Nazis “stretch across all branches of service, they are linking up across the branches once they’re inside, and they are hard-core,” Department of Defense gang detective Scott Barfield told the Intelligence Report. “We’ve got Aryan Nations graffiti in Baghdad,” he added. “That’s a problem.”The armed forces are supposed to be a model of racial equality. American soldiers are supposed to be defenders of democracy. Neo-Nazis represent the opposite of these ideals. They dream of race war and revolution, and their motivations for enlisting are often quite different than serving their country.”Join only for the training, and to better defend yourself, our people, and our culture,” Fain said. “We must have people to open doors from the inside when the time comes.” “
This Reuters’ report is illuminating:
“White supremacists, neo-Nazis and skinhead groups encourage followers to enlist in the Army and Marine Corps to acquire the skills to overthrow what some call the ZOG – the Zionist Occupation Government. Get in, get trained and get out to brace for the coming race war.
If this scenario seems like fantasy or bluster, civil rights organizations take it as deadly serious, especially given recent events. Former U.S. Army soldier Wade Page opened fire with a 9mm handgun at a Sikh temple in Wisconsin on Aug. 5, murdering six people and critically wounding three before killing himself during a shootout with police. “