Classes resumed Thursday morning after students and staff at New Prague High School were evacuated due to a bomb threat, WCCO reported.

A note was found in one of the school restrooms that indicated there was a bomb in the building, WCCO reported. Students and staff at the school roughly 45 miles southwest of the Twin Cities went to the nearby New Prague Ice Arena and Gymnastics Center while investigators searched the building, but nothing turned up, according to the district website.

The investigation continues, WCCO reported.