He said the birthday girl, a three-year-old, was among the victims along with five other children between four and 12 years old.
Timmy Kinner showed up late Saturday at the complex, which houses many resettled refugee families in Boise. Kinner is not a refugee, and he was a temporary resident of the apartments until he was asked to leave on Friday, USA Today reported.
Authorities responded to a call about a man with a knife at around 8:46 local time.
Bones identified the suspect as a 30-year-old man from out of state, but were not aware of the motive. Police say he briefly stayed at the apartment complex but was recently asked to leave because of behavior problems.
Bones said police hope to release the suspect's identity Sunday. "He's not a refugee". As part of former President Barack Obama's refugee resettlement program of 2012, Boise has become a magnet for refugees, including many from Syria. Boise Mayor Dave Bieter said the attack "does not represent Boise" and he asked citizens of the community to keep the victims in their prayers.
"The senseless acts of one disturbed person does not change that. We must come together to condemn this vile act".
"This is a chance to reaffirm who we are, what we stand for and those values and those commitments are deep and long lasting and we'll go forward", Bieter said.
Boise Police Chief Bill Bones holds a news conference Saturday night about multiple stabbings at the Wylie Street Station Apartments off State Street in Boise.
Four the victims' injuries remained life-threatening as of Sunday morning, police said in a statement.
"It's a community within our community", Bones said of the incident.
"As you can imagine, the witnesses in the apartment complex - along with the rest of our community - are reeling from this attack", the police chief said.
Timmy Kinner, 30, of Los Angeles, was arrested on nine felony charges of aggravated battery and six felony charges of injury to a child.
The victims included six children who were attending a birthday party at the apartment complex Saturday night.
Police found nine victims - inside and outside the apartments - and rendered first aid.
"It is heartbreaking to know that people and children who fled horror of war and conflict to find safety in America and the Boise Community had to experience violence all over again". "It's untenable, unconscionable and is pure evil, in my mind".