The mistake was discovered at a laboratory in Maryland. State health departments have done risk assessments and Maryland offered antibiotics to four lab workers due to possible exposure. Defense Department and other agencies, including the FBI, traced than the shipments which finally were destroyed in accordance with appropriate protocols. There is no known risk to the general public and there have been no suspected or confirmed cases of anthrax infection as a result of the inadvertent shipmen, officials said. DoD lab in Dugway, Utah, has stopped the shipment of this material from its labs pending completion of the investigation. For the instant no responsibilities was decided in this case. If not properly treated, anthrax is a high risk for deadly infection.