CHICAGO (CBS) — A teen was arrested on disorderly conduct charges for threatening to shoot his ex-girlfriend.

According to Joliet Police, the 14-year-old threatened to shoot her in the head.

Administrators at Plainfield South High School were made aware of the threat and investigated.

They found pictures of a semi-automatic handgun on the teen’s cellphone.

After a preliminary investigation,  they found that the teen had sent pictures of himself with a gun to his ex-girlfriend in the past.

The Kendall County State’s Attorney’s office approved felony charges against the teen.

He was transferred to the St. Charles Juvenile Correction Center.