A suspected gang member opened fire on a group outside a US high school, sending three young people to hospital.
The victims are students at Rosemary Anderson High School in the northwestern city of Portland or in related job training programs, police say.
A 16-year-old girl was in critical condition, and two males - ages 17 and 20 - were in serious condition. A fourth person - a 19-year-old woman - was grazed by a bullet but not hospitalised.
The shooting happened at a street corner outside the school, where 190 students are enrolled, Police Sergeant Pete Simpson said.
Witnesses said there may have been a dispute outside the school, but police said they didn't know who was involved.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
The assailant and two other people fled, and the wounded students went to the school for help, he said.
A nearby high school and community college were put on lockdown.
Preliminary information suggests the shooter has gang ties, Simpson said.
"That may not have anything to do with the shooting," Simpson added.
"The students may not at all be related to gangs. We don't want to leave that conclusion with anybody."
Rosemary Anderson High School serves at-risk students who were expelled or dropped out, or who are homeless or single parents.
Portland police have said there was a recent spike in gang crime and have complained they don't have adequate resources to address the problem.
