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Four students were killed and a fifth was wounded at Marysville Pilchuck High School in Marysville, Washington, on Oct. 24, 2014, when 15-year-old freshman Jaylen Fryberg opened fire at a cafeteria table before shooting himself and dying at the scene, police said.

The first 911 call came in at about 10:39 a.m., during the first lunch period. The school's resource officer reached the cafeteria roughly a minute later and reported over the radio that there was a shooter and five people were down. Medics arrived about 10 minutes after the initial dispatch.

The school was placed in lockdown, and Marysville police were joined by Snohomish County sheriff's deputies, Washington State Patrol troopers, fire and medic units and federal agents. The wounded were taken first to Providence Regional Medical Center Everett, and two were later transferred to Harborview Medical Center in Seattle.

Officers spent about two hours clearing classrooms and walking out hundreds of students who had locked themselves in. Students were loaded onto school buses and driven to Shoultes Christian Assembly, a church about half a mile from the campus, where the American Red Cross helped run a reunification site and parents waited to be matched with their children.

Zoe Galasso, 14, died in the cafeteria. Gia Soriano, 14, died Oct. 26. Shaylee Chuckulnaskit, 14, died Oct. 31. Andrew Fryberg, 15, died Nov. 7. Nate Hatch, 14, was hospitalized and survived. Classes at the school resumed Nov. 3.

The Snohomish County Multiple Agency Response Team investigated and released more than 2,200 pages of records on Sept. 1, 2015. "This was a homicide. It was premeditated and calculated," Marysville Police Chief Rick Smith said in a statement issued the same day. Smith said a first-year social studies teacher, Megan Silberberger, had moved toward the gunman as he reloaded, and that without her actions there would have been more deaths. Investigators later said she did not touch him in the moments before he shot himself.

The handgun used in the shooting belonged to the gunman's father, Raymond Fryberg Jr., who was barred from possessing firearms under a protection order. He was convicted in federal court of unlawful possession of firearms and sentenced in January 2016 to two years in prison. The cafeteria was never used again. The district opened a replacement commons in January 2016, built with $5 million appropriated by the state Legislature plus state matching money and district capital funds.

The recording is police radio traffic from the response, running about two hours. It combines law enforcement channels from roughly 10:39 a.m. to 12:40 p.m. and was released by the county's emergency dispatch center under Washington's public records law. It carries the first report of the shooting, the lockdown, units from several agencies checking in as they reach the campus, the room-by-room search of the buildings, medical transport and the move to the reunification site. It is a logging tape, so routine traffic from unrelated calls runs alongside the response.