A retired Las Vegas Metropolitan Police Department sergeant commends the Metro Nashville Police officers' quick response to the active shooter at a private Christian school 10 miles south of central Nashville on Monday.

Richard Strader retired from the department six years ago but recalls his active shooter training with LVMPD. He said the officers in the body camera footage that was released less than 24 hours after the shooting, appear to follow the steps that's standardized around the country.

"They were motivated to go into this school and eliminate the threat that was bearing down on the children and faculty at that school, and they did that relatively quickly," Strader said. "The policy in the past, and seems like it's pretty much the same, is that once they get an 'element,' which is three or four officers that are trained in active shooter, they are to go inside and basically locate the suspect, eliminate threat."

The video shows a team of officers from the Metropolitan Nashville Police Department arriving to the Covenant School. They rush in as alarms ring, and gunshots are heard. Officers quickly search the school by going room to room and then rush up the stairs to the second floor and fire bullets at the suspect, who is seen falling to the ground.

"You have to eliminate the threat. I have no criticism for that," Strader said. "That's how active shooter training is basically sent out around the country. It's standardized, and it's that way so that multiple jurisdictions who come across an incident where they all have to respond and deal with the threat, at the same time, know what the tactics are, know what the communication hand signals, what's expected of them and so on."

The incident unfolded in less than 15 minutes after police received a 911 call about the shooter and arrived on-site minutes later.

Police identified the assailant as Audrey Elizabeth Hale, 28, of Nashville and a former student at the Covenant School. Officials said Hale killed three 9-year-old children, a substitute teacher, a custodian, and the head of the school. Metro Nashville Police confirmed Hale was under a doctor's care for an emotional disorder.