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A popular student responsible for a shooting at a Washington state high school on Friday invited his victims to lunch by text message, then shot them at their table, investigators said Monday.

Snohomish County Sheriff Ty Trenary said at a news conference that the five students were at a lunch table when they were shot by 15-year-old Jaylen Fryberg. Fryberg then committed suicide.

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Detectives are digging through reams of text messages, phone and social media records as part of an investigation that could take months, Trenary said.

“The question everybody wants is, `Why?'” Trenary said. “I don’t know that the `why’ is something we can provide.”

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Fryberg, a football player who was named a prince on the school’s Homecoming court one week before the killings, was a member of a prominent Tulalip Indian Tribes family. He seemed happy although he was also upset about a girl, friends said. His Twitter feed was recently full of vague, anguished postings, like “It won’t last … It’ll never last,” and “I should have listened. … You were right … The whole time you were right.”