"It is with deep sorrow we share the news that she has passed away today," the Boise Police Department said in a statement.
The girl was celebrating her birthday at an apartment complex when the suspect, 30-year-old Timmy Earl Kinner from Los Angeles, attacked nine people. Police said that some of the victims had "fled violence from Syria, Iraq and Ethiopia."
In addition to the 3-year-old, the wounded children are ages 4, 6, 8, and 12, the police said. Three adults were hurt when they tried to stop the attacker.
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