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It breaks me... It actually does... I know it seems like I'm sweating it off... But I'm not.. And I never will be able to...😔😫😖 — Jaylen Fryberg (@frybergj) October 21, 2014

Two of the gunman’s cousins were among the wounded. Fryberg fatally shot himself, according to witnesses, police and relatives.

Snohomish County Sheriff’s spokeswoman Shari Ireton said in a statement Saturday morning that the on-scene investigation at Marysville-Pilchuck High School was finished. A .40-calibre handgun was recovered, which authorities believe was the weapon used in the Friday morning shooting, Ireton said.

Brian Bennett, spokesman for the federal Bureau of Alcohol, Tobacco, Firearms and Explosives in Seattle, said his agency conducted a trace of the firearm and determined “the most recent purchaser of the gun.” He said he could not identify that person, adding it would be up to the local police to release that information.

Detectives confirmed a school worker attempted to intervene in the attack, but Ireton provided no other details about the worker’s actions.

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Student Erick Cervantes told KIRO-TV that the worker, a woman, briefly “intercepted” the gunman, who was trying to reload. Cervantes said the woman tried to move the gunman’s hand away, before he shot himself.

The gunman’s motives remained unclear. Some students described Fryberg as happy and social, even though he had recently fought with another boy over a girl.

Shaylee Bass, a 15-year-old sophomore, said she was stunned by the shooting.

“He was not a violent person,” she said. “His family is known all around town. He was very well known. That’s what makes it so bizarre.”