UPDATE: Of the four victims that have been hospitalized, two remain at Providence Hospital, while two were transferred to Harvard Medical Center. All of the victims were under the age of 18. Police are still on the scene investigating, and will continue through the night.
According to CNN, witnesses have identified the shooter as freshman Jaylen Fryberg.
The hospitalized victims that went into surgery include two young women, and one young man. All three had primary head wounds.
According to two law enforcement sources, two people have been killed in Friday's shooting, with one of those deceased being the shooter.
According to a Providence Regional Medical Center spokesperson, four victims were hospitalized, and the three most critically injured patients are in surgery.
Moments ago, PD Commander Robert Lamoureux addressed the press to confirm one fatality at the scene. He explained that this person is believed to be the shooter and that the police are "confident" there was only one shooter on premises.
However, the school is still on lockdown as the police continue to sweep the campus. Commander Lamoureux confirmed that someone at the school called 911 to report the shooting, but gave no further information.
At this time, he had nothing further on the shooter's motive, identity or any information on others who were injured.
A shooting has been reported at the Marysville Pilchuck High School in Marysville, Washington at about 10:45 a.m. Friday.
According to the Seattle Times, there are reports that multiple people have been injured, including the shooter, after shots were fired in the schools cafeteria. Live aerial footage from the scene shows several students evacuating the school with their hands above their head, while others are being shuttled by bus to a nearby church.
However, the school remains on lockdown "due to an emergency situation," the school district said in a statement, with some students and faculty still inside.
This story is developing. More details to come.