The school, which is between Spokane and Rockford, has 327 students, according to media reports.
After he was killed, air force veteran turned high school custodian Joe Bowen, 42, convinced the gunman to stop shooting for long enough for him to be brought down by police. All Freeman School District and all Spokane School District schools went into lockdown but the Spokane District lifted the lockdown just before 11:30 a.m. They were listed in stable condition. Some students alerted counselors, the teen said, but it wasn't clear what school officials did in response.
Senator Maria Cantwell tweeted, "Closely monitoring devastating news of the school shooting in Spokane County".
Students say they were at their lockers when they heard what sounded like a binder being dropped on the floor. As shock turned to grief in the hours after the country's latest school shooting, they told of a honest young man with a penchant for joking around, even after burying his own father, who died in an accident - on Father's Day.
Schaeffer confirmed the person in custody was the lone shooter and didn't release the suspect's age.
Freeman High School sophomore Sam Strahan has been identified as the student killed in the shooting, The Spokesman-Review reports.
He's blamed for shooting a schoolmate to death and injuring three others at the school Wednesday before an overseer halted him.More news: Dalvin Cook Breaks Vikings Record for Rushing Yards in Rookie Debut
Investigators are trying to determine whether bullying was the main motive in the shooting.
The shooter was stopped by a janitor at the school.
A two-lane road into the town of about 500 people near the Idaho border was clogged as anxious parents sped to the school. "It's hard to contain your emotions", said Mr. Brito, a Freeman High School employee.
Its been unbelievable, within probably 15-20 minutes of hearing about it, Id already received a phone call, Id already received a text message saying that their school is OK, she said. "I was about to put my things away, and I just heard a loud 'pop, ' and I just looked behind me and, the shooter, he was just walking down the hall very calmly".
A year ago, an adolescent killed his father and then shot and wounded two children and a teacher at a SC primary school. He advised officers he needed to instruct "everybody a lesson about what happens when you spook others". She commended the school district for its communication with parents.
A call to the school was not immediately returned.
Gov. Jay Inslee said in a statement that "all Washingtonians are thinking of the victims and their families, and are grateful for the service of school staff and first responders working to keep our students safe".