No, not as far as anyone has reported. 9 firefighters had injuries, mostly smoke inhalation. The shops were all small independent business and artist studio type things, and I'm guessing many, if not most, were closed or not open at that time on a saturday. Here's one writeup, google search provides many more:

http://www.projo.com/massachusetts/content/mill_fire23_07-23-07_FK6FEQ8.238ce5a.html