OGDEN -- The FBI has determined a mysterious substance discovered Thursday at the James V. Hansen Federal Building that forced an evacuation of the facility is not toxic.
However, it's still unknown what the substance is, Debbie Dujanovic Bertram, a spokeswoman for the FBI in Salt Lake City, said in a prepared statement.
The substance has tested negative for biological and radiological materials, Bertram said.
All floors in the federal building have been reopened and the FBI is continuing to investigate.
Approximately 200 employees were evacuated from the building at 324 25th St. and sent home after the material was discovered in an IRS office on the sixth floor around 12:30 p.m. Thursday.
A handful of people were kept in the building and decontaminated by hazardous materials teams.
The incident is the second of its kind in the area in a week. On April 22, a white powdery substance was found at an IRS building in Farr West. The substance turned out to be harmless.