The first security shots showed a typical Massachusetts street crowd, people walking the street. Worcester was traditionally a rather tough and ugly town, but like many areas in the old industrial Northeast, Worcester had been rather picking up lately. Nobody in the crowd showed any signs of aggression or rage. Certainly nothing was going on that would provoke the attention of the authorities and their various forms of machine surveillance. Just normal people shopping, strolling. A line of bank customers doing business with a debit-card machine. A bus taking on and disgorging its passengers.