Waukesha police have taken an 11-year-old boy into custody after reportedly discovering he was the one issuing threats last week against Hawthorne Elementary School students on a school-issued iPad.

According to a department news release, police identified the boy as the source of the threats on Oct. 21. The boy, a Waukesha School District student, admitted to sending the messages, the release said.

He reportedly posted the threats on an anonymous video-messaging app called musical.ly under the username "creepyclown123."

Hawthorne Principal Duy Nguyen said last week that the app was being removed from all school-issued iPads after the threats came to light. A parent told the school about the threats and triggered a district and police investigation into them.

Police did not identify the student responsible for the messages, but said the iPad he was using to post the threats was seized and added that they are "working with juvenile authorities for resolution of the case."

Nguyen and police called for parents to more closely monitor their children's internet usage.

"We want to stress that these devices, while they are powerful tools for learning, also require monitoring by parents when the devices come home every evening," Nguyen wrote in a letter to parents. "Your support in reviewing your child’s online activity supports us all in keeping our students safe."

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