Active assailant
Run: If you can safely escape, leave the area immediately. Take others with you if they are ready to go, but do not delay to gather belongings.
Hide: If you cannot safely leave, hide out of sight. Lock or block doors, turn off lights, silence your phone and remain quiet.
Fight: As a last resort, and only when your life is in imminent danger, use physical actions and nearby objects to disrupt or incapacitate the assailant.
When it is safe to do so, call 911.