No injuries were reported after an employee at the Cheney Federal Building opened an envelope and discovered a suspicious white powder Monday afternoon, a Casper Fire-EMS spokesman said.

Casper police, fire, emergency management, hazardous materials vehicles and federal agents converged at the building next to the post office and across from Pioneer Park about 4 p.m., Jason Parks said.

The immediate area where the employee worked was evacuated, Parks said.

"The person that opened the package was isolated, and we sampled the product here on site," he said.

Emergency responders think the sample did not appear to be dangerous, but it will be sent to another lab for further analysis, Parks said. "I can't confirm what the findings are at this point, but they're deeming it a nonhazardous white powdery substance."

He did not know from whom or to whom the envelope was addressed, he said.

While local emergency agencies responded to the scene, the investigation will be turned over to the federal government, Parks said.

Parks is not aware of similar incidents elsewhere at this time.

After the terrorist attacks on 9-11, there were many cases of suspected anthrax being mailed in the nation, including in Casper.