What 'bout That Anthrax Terrorism

Does anyone remember that innocent civilians died from anthrax, yetthe case remains unsolved. My recollection is that the anthrax had certain chemical traits that limited the pool of suspects. I also seem to recall that there was a "person of interest" in the case, but attempts to get the good on him were going nowhere, despite draining a pond. But really, there's been more progress on the Jimmy Hoffa case. Didn't these random attacks constitute terrorism, why doesn't anyone seem to care? Just wondering.