SEASIDE, Calif. (AP) — A teacher who accidentally fired a gun inside a Northern California classroom while teaching firearm safety has resigned.

KSBW-TV reports that Dennis Alexander submitted his resignation to the Monterey Peninsula Unified School District on March 29. It will be effective at the end of the school year.

Police say Alexander last month was pointing the gun at the ceiling to make sure it was not loaded when the weapon discharged. No one sustained serious injuries .

School district spokeswoman Marci McFadden says Alexander remains on administrative leave while the internal disciplinary process continues.

Alexander is an administration of justice teacher at Seaside High School, reserve Sand City police officer, and Seaside City Council member.

The coastal community is about 115 miles (185 kilometers) south of San Francisco.

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Information from: KSBW-TV.