The Princeton Police Department arrested two people in connection with suspicious packages found at three sites in Princeton on Wednesday.
A 17-year-old from Dalbo, 70 miles north of Minneapolis and an 18-year-old man from Princeton are awaiting charges.
The packages were found outside the Princeton high school, behind a post office, and at the city's public utilities office. Testing later found they did not contain hazardous materials.
The discovery of the packages prompted schools to close and explosives experts to comb the town of 4,500 with bomb-sniffing dogs.
School was back in session Thursday and Friday.