13-year-old girl posts shooting threat against school on Instagram

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A 13-year-old girl who attends T.W. Browne Middle School in Dallas was arrested after posting a threat against the school online.

A Dallas Fox affiliate claims that the photo she posted shows a man with a gun and a caption that says that students at the school would be killed.

Dallas Independent School District police say they believe the girl posted the photo to gain more followers.

The teen told police that she found the photo online -- which was linked to this user account, which has not yet been confirmed by police.

Police say the girl, whose name hasn't been released, faces a juvenile charge of making a terrorist threat.

That conviction can carry a penalty of up to 10 years in prison.