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Officers from the Methuen, Mass., police department carry training weapons as they search the halls of a school during a demonstration in Methuen, Tuesday, Nov. 11, 2014. School and police officials have unveiled a new system to detect and track a gunman that they say is the first in operation in a public school. (AP Photo/Charles Krupa)

With students off for the Veterans Day holiday, a simulated school shooting at a Methuen grammar school on Tuesday showed what “active shooter” technology could do to help police catch a gunman if the horrible threat ever strikes as it has at other schools across the country.

In the live demonstration, the “gunman” entered the school armed with an assault rifle, opening fire with dummy rounds first in the school library then rampaging through hallways and classrooms. But he had only a few minutes to wreak havoc.

Smoke alarm-sized sensors installed in classrooms, hallways and other points throughout the building were activated by the sounds of gunfire, and police officers were immediately able to track his movements and quickly subdue him.

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