NASHVILLE, Tennessee: A heavily armed former student killed three young children and three senior employees in what appeared to be a carefully planned attack at a private elementary school in Nashville on Monday, before being shot dead by police.

Chief of Police John Drake named the suspect as Audrey Hale, 28, who left behind a manifesto and had maps of the school detailing surveillance and entry-exit points.

The suspect was “prepared for a confrontation with law enforcement,” Drake told reporters following the latest outburst of gun violence in the United States.

In an interview with NBC News, Drake said the suspect was likely plotting a broader attack, as the manifesto “indicates that there was going to be shootings at multiple locations, and the school was one of them.”

Armed with at least two assault rifles and a handgun, Hale entered The Covenant School, a Christian academy, from a side entrance, allegedly shooting through a door, firing multiple shots while advancing through the building, according to police.

Police identified the six victims, saying one of the three children was 8 years old and two were aged 9, while the adults killed were ages 60 to 61.

One of the victims, Katherine Koonce, is listed as head of the school on the academy’s website.

There was some initial confusion about the shooter’s gender identity, but police later said Hale was transgender.

Officers were on the scene within about 15 minutes of receiving the first emergency call at about 10 a.m. (11 p.m. in Manila), engaging the shooter, who returned fire before being shot dead.

Television images showed children holding hands as they left the school. One photograph showed a child sobbing through the window of her yellow school bus as it pulled away from the crime scene.

‘So scary’

Avery Myrick said her mother, a prekindergarten teacher at Covenant, hid as shots rang out through the school.

“She said she was hiding in the

closet, and that there was shooting all over and that they had potentially tried to get into her room, and just that she loved us,” Myrick told WSMV4 television, an NBC local affiliate.

On Monday night, as the country digested another mass shooting that claimed children’s lives, people left flowers

and stuffed toys at a growing makeshift memorial outside the school. Some kneeled in prayer.

Nurse Stacie Wilford said it was “so scary” to have a shooting so close to home. She lives nearby and has an 8-year-old who attends a school only 2 miles down the road from The Covenant School.

“Whenever you hear about

school shootings in other states, yes, you feel it, but when it’s at your back door, it just sets in differently,” Wilford told Agence France-Presse (AFP).

School shootings are alarmingly common in the US, where the proliferation of firearms has soared in recent years.

President Joe Biden described the latest shooting as “sick” and said gun violence was “ripping the soul of this nation,” as he urged Congress to pass a ban on the assault weapons often used in mass shootings.

Mass shooting epidemic

The Covenant School is a private Presbyterian institution with just over 200 students, from preschool to roughly age 12.

The school was founded by and housed in the Covenant Presbyterian Church, part of a theologically conservative denomination, The New York Times reported.

The Times said one of the children who died in the shooting was Hallie Scruggs, the daughter of the church’s pastor, Chad Scruggs.

Drake said investigators were working on a possible motive, but that it was “not confirmed.”

Asked whether Hale’s gender identity may have been a factor, he replied: “There is some theory to that. We’re investigating all the leads.”

There have been 129 mass shootings — defined as incidents in which four or more people were shot or killed — so far this year, according to data from the Gun Violence Archive.