Of course not. But whoever dispersed it, didn't have to make it themselves. It could have been stolen from an American laboratory. Although, if stolen in a large enough quanitity, we probably would know about it. And since they are saying that if would be difficult to reproduce, that brings us back to Iraq or the Russian black market.
But anthrax from the Russian black market would not be sensitive to antibiotics, as this anthrax is. That leaves Iraq.