The Internal Revenue Service office in Covington, Kentucky was closed Tuesday after a mailroom employee said she saw a cloud of white powder come from an envelope after it was opened.
The office was closed for six hours. The mailroom employee who opened the envelope was decontaminated by hazardous materials personnel and then taken to a nearby hospital for observation, however the employee did not exhibit any signs of illness. Seven other mailroom employees were also quarantined at the hospital.
The Federal Bureau of Investigation examined the envelope and determined there were no harmful chemical substances, nor was there any threat posed by the written material contained in the envelope.