UPDATE: Police say Waterloo teen admitted bringing gun to school - KWWL

A Waterloo teen was arrested on Wednesday after police say he brought a gun to Hoover Middle School.

Captain Tim Pillack says that officers went to Hoover Intermediate School on Hillcrest Road at about 3:25 p.m. after reports that a student had a gun in his backpack.

When officers arrived, staff gave them the backpack and Pillack says officers found an unloaded semi-automatic handgun.  They say there was no ammunition in the backpack.

The 13-year-old student was taken into custody for carrying a weapon on school grounds and was later released to the custody of his mother.

Pillack says no threats were made against students or staff and the teen admitted bringing the gun to school to "show off".

An email sent to parents read: "This is a message from principal Dan Cox for Hoover parents and staff. After school today, we became aware that a student might have a weapon in a backpack. Police were called, and they responded to Hoover. An unloaded hand gun was found, and the police took a student into custody. There were no injuries. While our investigation continues, we have been told, and we believe that no threats had been made."