It must have been only two minutes when several co-workers were crying out, "They're evacuating the building!" Another said, "It's an Anthrax scare." I looked around, and people were moving, and then comes to our door a fireman fully equipped, with gas mask, and other ecoutements, asking, "Is there any one else in there?" I said, "Yes, what is going on?" The response was, "There was a suspicious package leaking a substance on the back dock." Two more fireman were behind him, I ran back in got my lunch bag, and sweater and went out past the gathering firemen, customers, and employees; I saw my boss before going out, and told him, "yeah, they mean it." Outside since I had about 8 minutes left on my tour, I asked him if he would take care of my end of day time. He nodded affirmative. There must have been more than a dozen firetrucks in the parking lot, several police cars, and by the time I was exiting in my car I saw the Hazard Response Team truck arriving. I suppose I'll have to follow this up.