Sure. That's why notes sent along with the Anthrax said "Death to America, Death to Israel, Allah is Great".
Or why it was timed to arrive as a "second wave" after the initial al qaeda attacks, and was mailed from locations known to have al qaeda agents living nearby.
And the fact that Czech intelligence warned us that Iraqis had met with al queda and appeared to have provided them with Anthrax manufactured earlier at the Iraqi Salmon Pak facility is just a coincidence.
I suggest you go look up the concept of "Occam's Razor" and the principle of parsimony...