A 14-year-old girl was turned over to the Racine County Juvenile Detention Center after she made threats against Union Grove High School on a popular social media site.

The threat was later determined to be a hoax and was deemed not credible by law enforcement officials, according to a press release by the Racine County Sheriff’s Department.

The department received an anonymous tip from Crime Stoppers of Racine County that a threat had been made against Union Grove High School. Officials investigated and found an Instagram post from Monday that showed a person wearing a clown mask. On the photo was a statement that “no one should attend school tomorrow because of a school shooter,” the press release reads.

The original post did not contain the threat. Investigators learned that the 14-year-old girl — who attends Union Grove High School — edited the photo by adding the threatening statement. The girl cooperated with the investigators and admitted to adding the threats.

The investigation is ongoing.

Denise Lockwood has an extensive background in traditional and non-traditional media. She has written for Patch.com, the Milwaukee Business Journal, Milwaukee Magazine and the Kenosha News.