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I hear an announcement made that says , "LOCKDOWN!" I should follow this procedure.
What is lock my classroom door, turn off the lights, and move all students to a corner of the room that cannot be seen from the classroom door or windows, blinds must be closed, and SILENCE IS MANDATORY! Administration or police officer will unlock your door and inform you it is safe to come out.
*Discussion point about various places on campus that are not classrooms.