Bristol School administrators are warning parents to closely monitor children’s cell phone use after a “sexting” incident involving middle school students.

The Kenosha Sheriffs Department is investigating the incident involving a group of eighth graders. According to Sgt. Gil Benn, a girl in eighth grade took a topless photograph of herself, then sent the photo to a boy’s cell phone. That boy forwarded the photo to a second boy, who then forwarded the photo to multiple Bristol students.

“At this point we’re not sure that this individual case rises to the level of a criminal case,” Benn said. “It’s on the borderline.”