The school would go into a lockdout situation if there was criminal activity in the area.
In a lockdown situation the bells rings to go to lunch, you should release the students.
Students are NOT able to move about the campus during a lockout situation.
The school would go into a lockdown situation because of threats in the area.
The four actions a teacher must take during a lockdown are: Cover window, Turn off lights, lock door, Remain silent
Run, Hide, or Fight is the procedure you should use if a bad guy is trying to get into your room during a lockdown.
You know a lockdown situation is over when you hear the All Clear over the PA system.