KATU-TV reported the shooting happened as hundreds of people were waiting for a private party to begin on the Portland Spirit.
Sgt. Pete Simpson said police are looking for three people who ran away from the scene around 11 p.m.
Police have identified the victims as 26-year-old Leonard Brightmon, 22-year-old Xavier Bolden and 22-year-old Ronnie Smith.
Police expect all three victims to survive their gunshot wounds, although Smith was in critical condition on Saturday night.
Information from: KATU-TV, http://www.katu.com/
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