The short answer
Call 911 for an immediate threat to life, violence, a weapon, fire, serious medical emergency, forced entry, crime in progress, or another situation requiring public emergency authority. Call private security for property-specific assistance within its assigned duties—such as a routine patrol request, gate or access issue, non-emergency rule concern, suspicious condition without immediate danger, escort request if offered, or documentation for management.
What to know
Private security serves a defined client property and follows the contract and post orders. Police serve the public, enforce law, investigate crimes, and have governmental authority. Arizona law makes the distinction explicit: a security guard or armed guard does not possess peace-officer authority and performs duties as a private citizen.
When uncertain and safety may be at risk, contact 911. Do not delay an emergency call while waiting for a patrol officer or property manager. After calling, notify security if it is safe so the officer can help direct responders, protect access, communicate site details, or preserve observations. Communities should publish the security number, management number, non-emergency police number, and 911 guidance in plain language. Arrow’s post orders should define which resident calls officers accept, expected response within the property, notification to management, and when security itself calls police, fire, or EMS.