Police say Timmy Kinner attacked a group of children and adults at the girl's party at an apartment complex that is home to many refugee families.
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LA man accused of stabbing 9 people in Idaho
The child whose birthday it was has died of her wounds, according to the court.
A judge told Kinner on Monday that he is charged with first-degree murder as well as several felonies in connection with the Saturday night attack.
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Kinner is American, and the victims are members of refugee families from Syria, Iraq and Ethiopia. Boise Police Chief William Bones says evidence doesn't suggest the attack was a hate crime.
Bones says Kinner had recently stayed at the apartment complex but was asked to leave Friday over bad behavior.