We'll update this post as we know more, but for now The Everett Herald is reporting that "gunfire has been reported at Marysville Pilchuck High School" and the school is on lockdown.

The Seattle Times says "there are reports of as many as six people injured," but keep in mind that these early numbers are often wrong. (Initial reports on the number of people injured in the shooting at Seattle Pacific University in June were way off, for example.)

11:57 am: Citing "two law-enforcement sources," The Seattle Times says the person believed responsible for the shooting "is dead from a self-inflicted gunshot wound."

12:06 pm: Rikki King of The Everett Herald reports "five confirmed people who have been taken to hospitals," with one of them headed to Harborview in Seattle.

12:15 pm: Jennifer Sullivan of The Seattle Times reports: "Only one person dead in Marysville Pilchuck schooting, the shooter. That person was a student. Marysville PD says no known motive."

12:19 pm: The campaign to pass stronger gun control measures in Washington State via Initiative 594 has sent out this statement:

We are heartbroken that gun violence has once again touched a Washington school. Our thoughts and prayers are with the victims and their families, everyone at Marysville-Pilchuck High School and the Marysville community.

While the facts of today's shooting are still unclear, we do know that incidents like these are examples of the gun violence that's all too frequent in our state. It is up to all of us to come together and work to reduce gun violence.

1:12 pm: Kari Bray of The Everett Herald reports that two people are now confirmed dead. One is the shooter. According to The Seattle Times, the other is a student.

2:57 pm: The Seattle Public School District, on Twitter, says that "as a precaution" the Seattle Police Department has "increased presence in Seattle Public Schools today."

3:45 pm: A statement from Governor Jay Inslee:

On behalf of nearly 7 million Washingtonians, Trudi and I send our deepest condolences to the students, staff and families of Marysville-Pilchuck High School, and particularly to the families of the young victims of today’s tragedy.

While there is much we don’t know about today’s shooting, I am certain law enforcement is doing all it can to provide answers. As we seek to understand what seems inexplicable, I know the families of Marysville-Pilchuck will find their friends and neighbors at their side to provide comfort and support in the coming days, weeks and months.

The loss of life today has left us grief-stricken and anguished — and I’m sure many young people and their parents are worried, too. Tonight, hug your children a little longer and seek comfort from loved ones. Take care of each other.