1. A system comprising: a sensor system including at least one sensor that measures behavioral data associated with one or more persons, the sensor being mounted in a public location where multiple people gather; an input system for inputting attack detection parameters; an alarm system including at least one alarm; a processor system including at least one processor; and at least one memory system storing one or more machine instructions, which when implemented cause the processor system to perform a method including at least: obtaining, by the processor system, the data from the sensor system, analyzing, by the processor system, the data, comparing, by the processor system, the data to data characterizing an attack, determining, by the processor system, whether the data indicates the attack based on the comparing, wherein the determining whether the data indicates the attack based on the comparing includes at least determining whether the data indicates the attack based on whether a threshold density of people exhibit behaviors indicative of duress, if the determining results in a determination of the attack, classifying, by the processor system, the attack into a type of attack classification based on pre-established rules, sending a signal to the alarm system that causes an alert to be sent, and providing, by the system, the type of attack classification and location information indicating a location of the attack.