This is not supposed to be a danger to the general population  but raises lots of questions about security when dealing with anthrax. The Pentagon revealed Wednesday that  live anthrax  was shipped, apparently by accident, from a lab in Utah to as many as nine states.Pentagon spokesman Col. Steve Warren assured  there is no known risk to the general public  and said an investigation is under way. But precautions are being taken for potentially exposed workers in labs where the samples were sent. A U.S. official told Fox News that four people in three companies are being treated for  post-exposure  and being prescribed prophylaxis.All samples are in the process of being collected by the Centers for Disease Control and Prevention.The material in question was prepared at Dugway Proving Ground, Utah, as part of what was described as a  routine  research process. It was then sent out to Defense Department and commercial labs in nine states   the shipments were supposed to include only inactive, or dead, anthrax when they were transferred. These were supposed to be dead spores anthrax, called AG-1,  a defense official said.But a private lab in Maryland, on May 22, informed the CDC that they thought the samples contained live anthrax. The CDC then informed the Defense Department. According to the Associated Press, the government has confirmed the Maryland lab got live spores, and it is suspected the others did as well, though not yet confirmed.Fox News also was told that one sample was sent to a South Korean base. The Department of Defense is collaborating with the Centers for Disease Control and Prevention in their investigation of the inadvertent transfer of samples containing live Bacillus anthracis, also known as anthrax, from a DoD lab in Dugway Utah, to labs in nine states,  Warren said in a statement. There is no known risk to the general public, and there are no suspected or confirmed cases of anthrax infection in potentially exposed lab workers,  he added.  The DoD lab was working as part of a DoD effort to develop a field-based test to identify biological threats in the environment. 