The threat of an Active Shooter is a very realistic threat we should prepare for and take very seriously 
It's a day like any other day at work as you co workers go about there tasks and hustle back and forth to meetings. Suddenly you hear gun shots and screams. You have an active shooter and the choices you make next can be life saving or have fatal consequences. 

An Active Shooter is an individual(s) actively engaged in killing or attempting to kill people in a confined and populated area; in most cases, active shooters use firearms(s) and there is no pattern or method to their selection of victims. There's no short list of these Paris, Sandy Hook, and the Pulse Night Club to name a few. Active shooter situations are unpredictable and evolve quickly. Typically, the immediate deployment of law enforcement is required to stop the shooting and mitigate harm to victims. Because active shooter situations are often over within 10 to 15 minutes, before law enforcement arrives on the scene, individuals must be prepared both mentally and physically to deal with an active shooter situation.

There are some common sense things you can do to protect yourself and prepare yourself for the event of an active shooter. Here are a few tips:
Know where the nearest two exits are: Knowing how to escape quickly is the best way to survive an active shooter situation. Always have two ways out. 
Be aware of your environment: We can easily get lost in the day to day grind and easily become unaware of what is going on around us. Don't develop tunnel vision. Avoid wearing things like head phones and such that dampen your senses unless required for your job. Also know what items nearby you could use as weapons if needed or to block doors.
Have a SCARE kit on hand: See the article on building a  SCARE KIT . It is full of items you can use. Make sure to NOT violate any company policy's or local laws.
Be prepared to ACT: In any emergency situation most people will panic. Make sure you are ready to ACT and take charge. 
Quickly determine the most reasonable way to protect your own life and ACT. Don't hesitate when seconds matter. People around are likely to follow suit. Remember you have three choices that you can make you can either RUN, HIDE, or FIGHT.  
If there is an accessible escape path, attempt to evacuate the premises. Be sure to:
Have an escape route and plan in mind
Evacuate regardless of whether others agree to follow
Leave your belongings behind
Help others escape, if possible
Prevent individuals from entering an area where the active shooter may be
Keep your hands visible
Follow the instructions of any police officers
Do not attempt to move wounded people
Call 911 when you are safe
If evacuation is not possible, find a place to hide where the active shooter is less likely to find you.
Your hiding place should:
Be out of the active shooter’s view
Provide protection if shots are fired in your direction (i.e. an office with a closed and locked door)
Not trap you or restrict your options for movement
To prevent an active shooter from entering your hiding place:
Lock the door. If you have a door stop place it under the door if the door opens inwards to make the door more secure.
Blockade the door with heavy furniture    
If the active shooter is nearby:
Lock the door. If you have a door stop place it under the door if the door opens inwards to make the door more secure. 
Silence your cell phone and/or pager
Turn off any source of noise (i.e., radios, televisions)
Hide behind large items (i.e., cabinets, desks)
Remain quiet
If evacuation and hiding out are not possible:
Remain calm
Dial 911, if possible, to alert police to the active shooter’s location
If you cannot speak, leave the line open and allow the dispatcher to listen
As a last resort, and only when your life is in imminent danger, attempt to disrupt and/or incapacitate the active shooter by:
Acting as aggressively as possible against him/her
Throwing items and improvising weapons

Law enforcement’s purpose is to stop the active shooter as soon as possible. Officers will proceed directly to the area in which the last shots were heard.
Officers usually arrive in teams of four (4)
Officers may wear regular patrol uniforms or external bulletproof vests, Kevlar helmets, and other tactical equipment
Officers may be armed with rifles, shotguns, handguns
Officers may use pepper spray or tear gas to control the situation
Officers may shout commands, and may push individuals to the ground for their safety
How to react when law enforcement arrives:
Remain calm, and follow officers’ instructions
Put down any items in your hands (i.e., bags, jackets)
Immediately raise hands and spread fingers
Keep hands visible at all times
Avoid making quick movements toward officers such as holding on to them for safety
Avoid pointing, screaming and/or yelling
Do not stop to ask officers for help or direction when evacuating, just proceed in the direction from which officers are entering the premises
Remember friends in this day and age Active shooter scenarios are on the rise and becoming more common place. You must prepare for these situations and train for them. If you work ask your employer what there plans are, if there isn't a plan start one. The department of Homeland security has an article to provide guidance on this topic. Click here to read there pamphlet. I also encourage you to make a  SCARE KIT  make sure to not violate any local laws or company policies. Stay safe and remember to ACT & Run Hide Fight.