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TROUTDALE, Ore. -- Dispatch and radio recordings provided a chilling real-time account of the police response to a deadly shooting at Reynolds High School.

The first radio call came in Tuesday morning at 8:05 a.m.

Got a report of shots fired in the locker room, at least one person down.

Four minutes later, arriving police officers worked to surround the gymnasium. Then, officers devised a plan.

I need to get at least five guys by the front of the gymnasium to make entry. A couple rifles at the very least.

Two teams made up of school resource officers and local police were the first to enter the building. Moments later, officers exchanged gunfire with the suspect.

We got a group of four making entry. We've got shots fired.

Within 14 minutes, police stopped the gunman. In the end, he killed a classmate and injured a teacher before turning the gun on himself.

More: Alleged Reynolds gunman a freshman, heavily armed

From what I've seen at Reynolds, the people that responded there initially did a great job, said Officer Russ Corno of the Portland Police Bureau.

Corno provides officer training for active threat scenarios.

As tragic as it was, a lot of lives were saved that day, he said.

When there is an active shooter, police assemble into small teams, typically four or five officers. It doesn't matter what police department they're from, whoever is available.

Then, the officers move in to stop the violence.

The first priority is to isolate the shooter, then get medical help to those who need it.

We always tell people that when you go to these events, you've got to do a pro-con analysis, said Corno. Make sure that you are going to make things better and if you think you can, intervene and make things better than go ahead and do so.

More: Hurt Reynolds teacher was hero among heroes

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