Classes resumed Wednesday at the Salem Senior/Junior High School on Wednesday after a phoned-in bomb threat forced an evacuation of the building on Tuesday.

In an open letter, School Superintendent Sean Kirkland stated that a person of interest, located out of state, is being seriously investigated as the suspect who called the threat into 9-1-1. 

Kirkland says the incident is being investigated as a federal crime.

A search of the school by bomb experts and a bomb-sniffing K-9 found no sign of an explosive device.

Students were evacuated to the nearby First Christian Church where they were picked up by their parents.

In addition, two polling places at the school were relocated to the church.

Kirkland told 21 News earlier Tuesday that he didn't believe the threat impacted voters who were casting ballots on a school levy.

The issue was defeated by more than 200 votes.