TROUTDALE, Ore. — A gunman shot and killed a student Tuesday at a high school in a quiet Columbia River town in Oregon shortly after classes started and was found dead himself as police arrived, authorities said.

The attack panicked students at Reynolds High School in Troutdale after a lockdown was ordered and they were told to quietly go to their classrooms.

Freshman Morgan Rose, 15, said she hunkered down in a locker room with another student and two teachers.

“It was scary in the moment. Now knowing everything’s OK I’m better,” she said.

Freshman Daniel DeLong, 15, said after the shooting that he saw a physical education teacher at the school with a bloodied shirt.

“I’m a little shaken up,” DeLong said. “I’m just worried.”

He said he was texting friends to make sure they were all OK.

“It just, like, happened so fast, you know?” he said.

Troutdale police chief Scott Anderson said he was sorry for the family of the slain student, whose name was not immediately released. Police also did not identify the gunman or say how he died.

“Today is a very tragic day for the city of Troutdale,” the chief said.

The first reports of shots fired came at 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 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 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-yeatr-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 an 111-year prison sentence.