An envelope that caused a hazardous materials scare and prompted the evacuation of a Janesville charter school Friday morning posed no threat, police said.
A hazardous materials crew was called to 1350 N. Parker Drive after an employee reported seeing a powdery substance come out of an envelope at around 10 a.m.
The employee worked in the mail processing room of a Hewlett Packard office on the second floor of a building that also houses TAGOS Leadership Academy, which was evacuated.
Investigators could not find any powder, however, and tests of the envelope and letter found nothing suspicious, Janesville police Deputy Chief John Olsen said.
"There wasn't anything to indicate any credible threat. ... All indications are that (the letter) was for normal business," Olsen said.
Two workers reported irritation and dizziness after being exposed to the letter and were sent to Mercy Hospital and Trauma Center in Janesville, Olsen said. Three other employees who were in the room were also taken to Mercy.
Those symptoms subsided before the workers reached the hospital, Olsen said, and no one needed medical treatment.
The TAGOS Leadership Academy is located downstairs from where the incident occurred, police said.
TAGOS was evacuated and students were sent to Franklin Middle School, district spokesman Brett Berg said. No one from the school reported any illness or injury.
The larger, main building at Arrow Park apparently was not affected.
The school district's TATE Center is in the same building but was not occupied at the time, Berg said.