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An active shooter alert at a Wisconsin high school appears to have been triggered by an errant Frisbee.

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According to investigators, students and staff at Indian Trail High School and Academy in Kenosha were alerted at around 10 a.m. Monday to implement their active shooter protocols, known as ALICE, which include barricading doors and evacuating classrooms, among other tactics, WISN reported.

“It is believed that the system was triggered due to a device malfunction, which is still being investigated,” a school official told the TV station.

Students, however, told WISN that a Frisbee thrown in the gym hit a sensor, triggering the automatic alarm system.

“They said, ‘It’s a shooter in the gym.’ So, when they said it’s a shooter in the gym, I’m kind of freaking out. But it’s a shooter in the gym. I’m right by the gym,” Indian Trail senior Marcelo Johnson told the TV station.

According to Seehafer News, the Kenosha Police Department conducted a full sweep of the building and issued the all-clear shortly after 11 a.m.

“All the information that has been given to us is that we have a malfunction due to a potential Frisbee strike with one of our (gun) shot detectors,” the school’s principal announced over the public address system after the debunked threat had passed.

Meanwhile, district officials declined to confirm the cause of the active shooter alert, citing the ongoing investigation of a device malfunction, WISN reported.