Threats have been made against several students who belong to the same Native American tribe as the 15-year-old who gunned down several classmates before
The tribe denounced Fryberg's actions on Wednesday and expressed concern about threats lobbed at Native American students in the school district.
"While some have been directed at Native children, we are concerned for the safety of all of the children. Many of our kids are fearful to return to school, and some parents are reluctant to send them," the statement read. "The Tulalip Tribes denounce the horrific actions of Jaylen Fryberg. ... All of the young people he attacked were his friends, and two were his cousins. Parents and children alike are struggling to understand what caused him to act in such a manner."
Police have not discussed a motive in the shooting, but postings on social media suggest Fryberg was bitter over a recent breakup.
Aaron Toso, a spokesman for the Marysville School District, told the Los Angeles Times that school officials had become aware of several unsubstantiated threats made in the wake of the shootings, including one posted on Facebook on Tuesday.
"There have been threats made, and any threat is taken seriously and looked into, and we've found that there have not been any substantiated threats," Toso said.
Asked if the district was concerned about increased violence or bullying aimed at tribe members after the shootings, Toso said: "We're always vigilant and we are working hard to make sure that we come together as a community."
Toso referred further questions to the Marysville Police Department, which did not return calls seeking comment.
Fryberg, a football player who was recently named freshman homecoming prince, died of a self-inflicted gunshot wound. On Tuesday, the Snohomish County medical examiner's office ruled his death a suicide.
Zoe Galasso and Gia Soriano, both 14, died of gunshot wounds to the head during the melee. Nate Hatch and Shaylee Chuckulnaskit, both 14, and Andrew Fryberg, 15, were seriously wounded but survived.
In their statement, the tribe warned that Jaylen Fryberg's actions were his alone.