By ARNOLD REEDArson has been determined as the cause of a fire that engulfed the Will county Private Industry Council (PIC) complex December 4, according to federal fire investigators.But who set the early-morning blaze is still unknown, said Edward Nickels, director of the arson division for the Illinois State Fire Marshall’s office. Nickels has called in local fire investigators and officials from the federal Bureau of Alcohol, Tobacco and Firearms to help gather witnesses and collect evidence.“OUR POSITION is to locate as many persons with information about the fire as we can. Some information may be relevant, and some may not be relevant,” Nickels said.“But what is unimportant today may be important tomorrow.”(Please turn to Page A-2)