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story.lead_photo.caption Saugus High School students Liliana, 15, (right) and her sister Alexandra, 16, carry a bouquet of roses Friday to place at a memorial for victims of Thursday’s shooting at the school in Santa Clarita, Calif. More photos are available at arkansasonline.com/1116shooting/

SANTA CLARITA, Calif. -- A 16-year-old boy planned the attack that killed two students and wounded three others at a Southern California high school, but investigators as of Friday had been unable to find out why he took a gun to campus and opened fire, authorities said.

After more than 40 interviews and evaluation of evidence, no motive had been established, said Capt. Kent Wegener of the Los Angeles County sheriff's office's homicide unit. He said no manifesto, diary or suicide note had been found.

"It still remains a mystery why," Sheriff Alex Villanueva told a news conference.

The teenager opened fire on his birthday Thursday morning after being dropped off by his mother at Saugus High School in the Los Angeles suburb of Santa Clarita. The shooter, who hasn't been identified, fired his last bullet into his own head and remained in critical condition Friday.

The shooting in an outdoor plaza took just 16 seconds and was recorded on security video, authorities said.

[Video not showing up above? Click here to watch » https://www.youtube.com/watch?v=XhqXVuRx_mw]

The teen stood by himself, did not appear to interact with anyone and then walked to the center of the quad, Villanueva said.

"As far as we know, the actual targets were at random," the sheriff said.

The sheriff said the conclusion that the attack was planned was based on the shooter bringing the weapon, handling it with enough expertise and counting the rounds fired.

"It wasn't a spur-of-the-moment act," Villanueva said.

The origin of the gun was being investigated.

Three off-duty law enforcement officers were first on the scene and treated some of the wounded until paramedics arrived.

One of the dead was identified as 15-year-old Gracie Anne Muehlberger.

The other student who died was 14. His name and those of the other wounded were not released.

Doctors said Friday morning that two girls, ages 14 and 15, were doing well and should be released from the hospital over the weekend. Both of them were shot in the torso.

A 14-year-old boy was treated and released from another hospital, authorities said.

The suspect was described as a quiet and smart kid who was a Boy Scout and had previously run track for his school.

"You have the image of a loner, someone who is socially awkward, doesn't get along, some violent tendencies, dark brooding and online strange postings -- stuff like that," Villanueva said. With this boy, investigators have found "nothing out of the ordinary. He's a cookie-cutter kid that you could find anywhere."

In fact, the stereotype of the loner sociopath is often inaccurate, according to the psychologist who wrote federal guidelines for assessing school shooting threats and has interviewed 10 shooters.

What pushes most shooters is some kind of loss or disappointment, often recent, followed by the inability to cope with a feeling of being overwhelmed, according to Marisa Randazzo, a former chief research psychologist at the U.S. Secret Service.

"These are acts of suicide as much as homicide," said Randazzo, who is now chief executive officer of a firm that does threat assessments.

Gallery: Saugus High School shooting victims 'doing well,' hospital says

[GALLERY: Saugus High School shooting victims 'doing well,' hospital says » arkansasonline.com/1116shooting/]

Most shooters she studied were academically successful and weren't social outcasts.

Friends said while the boy could be introverted, he had a girlfriend and good social network focused on his cross-country teammates.

Randazzo said she expects investigators will learn that someone in the boy's social circle had an inkling of trouble.

A Section on 11/16/2019

Print Headline: Motive sought in school shooting

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