An EA-6B Prowler military plane crashes about 50 miles west of Spokane, Washington, United States, and kills three American Navy crew members.
An attack on an electrical substation in Pierce County, Washington, United States, cuts off power to 14,000 people. The perpetrators and motive of the attack are unknown.
A student is killed in a shooting at Ingraham High School in Seattle, Washington, United States.
One person is killed and nine others are missing after a floatplane crashes in the Puget Sound near Seattle, Washington, United States.
Washington becomes the first U.S. state to legalize human composting, the right to allow people to have their body turned into soil after death. The process is seen as an alternative to traditional cremations and burials.
The Seattle City Council unanimously votes to give Uber, Lyft, and other contract drivers the power to join trade unions. The Washington city becomes the first in the United States to do so. Seattle Mayor Ed Murray opposes the bill which can still become law without his signature. Court challenges are expected.
Xi Jinping begins his first visit to the United States as President of the People's Republic of China, meeting with technology company leaders and representatives in Seattle, Washington.
Effective midnight, Washington, D.C. joins Alaska, Colorado, and Washington state as the only places in the United States that locally purport to override federal law and allow the use of marijuana for recreational purposes.
A fire destroys 20 homes on the Yakama Indian Reservation in the US state of Washington.
All 3 dead in US small plane crash in southwest Washington state, about 10 miles (16 km) northeast of Morton.
United States cartoonist Molly Norris of Seattle, Washington, who developed Everybody Draw Mohammed Day, goes into hiding following a death threat from an Islamist radical.