Hazardous materials crews converged on the Brown University Graduate Center on Thayer Street in Providence Thursday evening after a strange smell sickened eight people.
One of them was taken to the hospital, though police say it was more from anxiety than the smell.
The Providence Journal reported Friday that the state Department of Health determined there was no "biothreat."
Deputy Fire Chief James Mirza told NBC 10 the smell came after a couple of envelopes were opened in an office.
The symptoms were described as minor by fire officials.
"Respiratory irritation, throat, eyes, ears, things like that. Not sure what it was. They said they witnessed a chemical type odor coming from the envelopes," Mirza said.
Firefighters suited up in hazardous materials gear to go in to the building but their monitoring devices found no sign of contamination on the people who were exposed. That part of the building was evacuated.
Investigators are trying to find the cause of the smell but Providence police told NBC 10 there does not appear to be any criminal intent in what happened.
"The envelopes, the letters were secured, bagged. They're being transported to try to get evaluated at the state lab. The FBI has taken over on that end," Mirza said.
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