SPENCER, Iowa (KCAU) — A 15-year-old girl was arrested in Clay County after allegedly making threats against Okoboji High School.

The Clay County Sheriff’s Office said in a release that the FBI reached out to the sheriff’s office Monday about “some concerning messages” that were sent on Snapchat.The FBI said that Snapchat informed them that a 15-year-old juvenile who lives in Clay County made a threat to Okoboji High School in a Snapchat message to her friends.

The sheriff’s office investigated the incident and arrested the teen on charges of threat of terrorism, a class D felony. The teen was later released to her parents.

Authorities are still investigating the incident.

The FBI, Clay County Attorney’s Office, and Milford Police Department assisted the Clay County Sheriff’s Office.