HILL CITY, Minn. -- A northeast Minn. school district closed school on Thursday, Feb. 22,  in response to a threat against the school made on social media.

The Aitkin County Sheriff’s Office reported the threat was specifically made toward Hill City Schools and some students. The Sheriff’s Office, Hill City Police Department and Minnesota Bureau of Criminal Apprehension are investigating the threat.

Superintendent Pat Rendle said Hill City high school students made adults aware late Wednesday night that a situation was escalating on Snapchat.

Students were forwarding and creating screenshots of conversations they were having with an individual who was anonymous at the time, Rendle said. The person, who has not been determined to be a student, was making threats to come to the school and the threat was tied to an incident last week for which a student was disciplined, Rendle said.

The conversations on social media escalated and the threats became specific, he said. Students became worried and began telling parents, coaches and school board members.

After involving law enforcement, school leaders decided to “take the words for what they were” and cancel school, Rendle said.

Hill City is located about 17 miles south of Grand Rapids.