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"Oregon hurts as we try to make sense of a senseless act of violence," the governor said in a statement.
The first reports of shots fired came around 8 a.m. on the next-to-last-day of classes. Police initially seemed uncertain about whether there was a live shooter in the school.
Students were eventually led from the school with hands up or on their heads. Parents and students were reunited in a supermarket parking lot.
Mandy Johnson said her daughter called from a friend's phone.
"I thank God that she's safe," said Johnson, who has three younger children. "I don't want to send my kids to school anymore."
The Reynolds School District issued a statement mourning the loss of one of its students.
Reynolds is the second-largest high school in Oregon, with about 2,800 students. The school is about 15 miles from Portland and its students come from several communities.
During the evacuation of the school, authorities found another student with a gun and he was taken into custody. That weapon and arrest were not related to the shooting, Anderson said.
The Oregon violence came less than a week after a gunman opened fire on a college campus in neighboring Washington state, killing a 19-year-old man and wounding two others. It follows a string of mass shootings that have disturbed the nation, including one on Sunday in Nevada that left two Las Vegas police officers and a civilian dead.
The Tuesday shooting was the first fatal school shooting in Oregon since May 1998 when 15-year-old Kip Kinkel killed two students and wounded 25 others at Thurston High School in Springfield near Eugene. He killed his parents prior to the attack and is serving a 111-year prison sentence.