TEMPE, Ariz. (AP) — Authorities say a Tempe school resource officer accidentally fired her department-issued Taser during a demonstration, striking a student in the arm with one probe.

Tempe police say the female officer was doing a show-and-tell Friday afternoon for an eighth-grade class at Gilliland Middle School.

They say she pushed a button that tests whether the Taser is working.

Police say the officer then mistakenly pulled the trigger and one of the two probes hit a 14-year-old girl in the left arm.

Since the other probe went into a wall, police say no electrical current was delivered and the student wasn't shocked.

However, the student was taken to a hospital where she had the probe removed.

Police say the resource officer has been removed from the school while the incident is investigated.

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