Summarize the following:
Stay calm, get to the ground, and cover your head the moment you hear shots fired. Don't flee immediately, as you won't know the origin of the shots or whether there's crossfire. Once you've determined where the gunfire has come from, run away in the opposite direction. If you're within the shooter's range, try to run in a zigzag pattern so they'll have a harder time targeting you. When a robber points a gun at someone, the aim is to get that person to surrender money or valuables. In these situations, it's important to comply. In an active shooter situation, the assailant's intent is to harm, so fleeing and hiding are the best responses. If you're in an active shooter situation in a public place, run away from the shooter and head for the nearest exit. Leave your belongings behind and evacuate as quickly as possible. If there are responding police officers in the vicinity, remember that they probably don't know who the shooter is. Don't be afraid of them, but make sure your hands are visible and follow any instructions they provide. Run as far away from the building as possible. Don't stop outside the door or in the parking lot. Run to your school or business's designated secure location, to the place police instruct you to go, or until you're certain you're out of danger. If there's no available exit, look for a room that locks from the inside or can be barricaded. Lock the door, turn off the lights, close the blinds, and block the door with heavy furniture. If you can't get to a locked or barricaded room, try to find a spot where you'll be out of sight. Silence your cell phone; do not leave it on vibrate. Don't respond to any knocks on the door, even if the person says they're a police officer. Remain absolutely quiet. If it's actually responding officers at the door, they'll likely break through to clear the area. Officers typically respond in groups of 4; they may have standard uniforms or wear tactical gear. Remember to put your hands up and follow their instructions so they know you're not the shooter. To avoid drawing attention to yourself, do not call emergency services in the presence of the shooter. Once you've evacuated to a secure location, call the authorities immediately. If you're hiding, don't talk on the phone unless you're certain the shooter isn't nearby. Stay as quiet as you can if there's any chance they're within earshot. If possible, send a text or use social media to alert others of the situation. If you cannot run or hide, throw objects at the shooter and shout aggressively. Look for objects that can be used as improvised weapons, such as a fire extinguisher, a chair, a potted plant, or scissors. If there are other people nearby, try to recruit them ambush the shooter. It's important to commit to your actions. Not everyone is comfortable with causing severe or fatal injury, and it's okay if you aren't. But if you're going to engage the shooter, you need to be committed to disabling them by any means necessary. Remember that running and hiding are the best options. Fight for your life only if there are no other alternatives.

Summary:
Duck and cover if you hear nearby gunfire. Run to a safe area, if possible. Hide in a secure spot if evacuating isn't possible. Call emergency services only once you're away from the shooter. Fight back only as a last resort.