SALEM -- Police and hazmat crews were investigating a powder substance found Wednesday morning at the Oregon Department of Revenue building mailroom.
An all-clear was declared just before 11 a.m. The Oregon National Guard determined that there was a powder that was not dangerous or toxic.
Investigators will need to do more tests on the powder described as being similar to an energy powder.
Police closed off Center Street near the building, which is part of the Capitol Mall in Salem. Only the first floor of the building was evacuated.
The substance was found by a worker on the first floor of the building about 7 a.m, according to Oregon State Police.
Karen Brown told KGW that a machine cut open an envelope that created a cloud of powder that went into a worker's face.
Seven people were quarantined in the area where the powder was discovered, but none appeared to be sick.
A Salem police SWAT team was assisting with the investigation.
KGW Reporter Art Edwards contributed to this report