Authorities partially evacuated a Capitol Campus building on Tuesday after someone found an envelope with a suspicious white powder.

The incident occurred around noon on the fifth floor of a building at 1500 Jefferson Street SE, which is across from Capitol Gateway Park and near Interstate 5 in Olympia.

The Special Operations Division of Washington State Patrol responded to the scene and evacuated everyone on the fifth floor, said WSP Communications Director Chris Loftis. The Olympia Fire Department, a hazmat team from Joint Base Lewis-McCord and a WSP bomb squad arrived on scene as well, he said.

"It took roughly 90 minutes for the process to evolve and have the experts in place to test the materials and make initial assessments," Loftis said.

The hazmat team determined the white powdery substance was not a hazardous material. Loftis said.

People who were exposed to the envelop received medical evaluations, he said. There were no reports of anyone having a negative reaction to the substance, he added.

Loftis said the Federal Bureau of Investigation has taken charge of the investigation and will test the substance in lab. He said he was unable to offer any details about where it came from or who it may have been addressed to.

People on the other floors were not required to evacuate but were allowed to leave, Loftis said. The fifth floor remained closed "all day long" for the investigation, he said. The building resumed normal operations on Wednesday.

Loftis advised the public to be call 911 if they see something suspicious. That will probably prompt a sizable response, Loftis said, but it's best to be cautious.

"We're always going to respond with the resources necessary to handle aggressive and dangerous situations..." Loftis said. "We would all rather suffer the indignities of inconvenience that the indignities of harm."