PINE CITY, Minn. -- A powdery substance found in six letters delivered to the Pine County Courthouse this week is some form of bacteria, the Minnesota Health Department reported.
While it may take two more weeks to determine the exact bacteria, the department said it is not "considered a significant health risk."
Soon after the letters arrived Tuesday, law enforcement officials delivered them to the Health Department laboratory in St. Paul for testing. While bioterrorism organisms quickly were ruled out, it took longer to discover the substance was naturally occurring bacteria.
