In today’s world, the ability to recognize the early warning signs of a potential active shooter threat can save lives. Most attackers don’t “just snap”—they often display observable behaviors leading up to an act of violence. By staying alert and educated, you can help prevent tragedy before it strikes.

Here are several key indicators to watch for and act upon:

1. Leakage of Violent Intentions

One of the most common red flags is “leakage”—when a person hints at or directly expresses their intent to harm others. This could come in the form of:

Take any mention of violence seriously. If something feels off, it likely is.

2. Sudden Behavioral Changes

Someone planning an attack may begin to withdraw socially, abandon responsibilities, or act unusually agitated. Watch for:

3. History of Grievances or Fixation

Many attackers fixate on a particular person, group, or perceived injustice. If someone constantly brings up a grudge or expresses a desire for revenge, it’s a signal worth reporting.

4. Fascination with Weapons or Tactical Gear

While lawful gun ownership is not itself a red flag, someone who suddenly becomes consumed with weapons, tactical clothing, or rehearsing “missions” could be a cause for concern of a potential active shooter threat—especially when paired with other troubling signs.

5. Verbal or Written Threats

Even vague threats should never be ignored. Whether it’s a comment made in frustration or a cryptic message left behind, these statements can indicate a person is moving from thought to action.

6. Unusual Interest in Security Protocols

If someone asks detailed questions about building access, surveillance blind spots, or emergency exits—particularly if they have no reason to—consider this suspicious and worthy of closer attention.

What You Should Do WITH A POTENTIAL ACTIVE SHOOTER THREAT

If you see something, say something. Report suspicious behaviors to your local authorities, school administrators, HR departments, or security personnel. Trust your instincts—reporting is not about accusing, it’s about preventing.

And most importantly, empower yourself through training. The ALIVE Active Shooter Survival Program teaches how to recognize threats, respond decisively, and increase your chances of surviving a violent encounter.

Be alert. Be informed. Be prepared.

Learn how to protect yourself and those around you by enrolling in an ALIVE training course today: Click here!

About the Author

Michael D. Julian is President of MPS Security & Protection and a 30-plus-year veteran of the security and investigations industry. He served as President of the California Association of Licensed Investigators (CALI) from 2005 to 2015 and has led executive protection, residential security, and corporate investigations engagements for Fortune 500 principals, high-net-worth families, and public figures across the United States. Connect with Michael on LinkedIn.