BURNSVILLE, Minn. – Like flash crowds of a decade ago, 20 to 30 people materialized seemingly from nowhere and grabbed dozens of electronic items at a suburbam Best Buy store. Just as quickly they vanished in a crowd of shoppers with their ill-gotten stashes. There were no weapons, police said. The caper was about 8 o’clock Friday night. Nobody was injured. No arrests were made. Several such mass robberies began occurring across the nation on the eve of the Thanksgiving weekend shopping rush.
