A California high school teacher unintentionally fired his gun Tuesday while leading a lesson on firearm safety, injuring three students, police said.

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According to KSBW and CNN, Seaside High School teacher Dennis Alexander, a Sand City Police Department reserve officer and the mayor pro tempore of Seaside, accidentally fired at the ceiling during his Administration of Justice class. Three students were hurt – including a 17-year-old boy with bullet fragments "lodged into his neck" – as debris fell from the ceiling, KSBW reported. Seaside police said the students' injuries were not serious.

The 17-year-old victim's father, Fermin Gonzales, said Alexander was preparing to show the students how to disarm a suspect and was checking whether his gun was loaded when the incident occurred.

Alexander, who "was not authorized to have a gun on campus," is now on administrative leave from the school and police department, KSBW reported.

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Scott Jackson (right), business service consultant for WorkSource Fulton, helps job seekers with their applications in a mobile career center at a job fair hosted by Goodwill Career Center in Atlanta. (Ziyu Julian Zhu/AJC)

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