Law enforcement officials says authorities are examining whether the employee who reported an explosion may have lied to investigators and staged the incident.
The parcel that blew up was one of two that were reported to police early in the evening.
Steve Waithe is accused of contacting track and field athletes and offering to help get rid of compromising photos of them he claimed he found online.
The students had to leave campus and will not be reimbursed for the semester's tuition.
The removal raises renewed concerns that Iranian students are being targeted amid increased U.S. tensions with Tehran.
A new database shows that there were more mass killings in 2019 than any year dating back to at least the 1970s
The chemicals, known as PFCs, have been linked to health issues but are mostly unregulated.