Mass Casualty Incidents in Washington

Every mass casualty incidents report published for Washington, newest first.

Mass Casualty IncidentsAug 12, 2026, 1:47 a.m. ETRevised · v3Seattle, Washington, United States
Seattle Council Presses Police Chief on Bite of Seattle Shooting as Councilmember Publishes Minute-by-Minute Timeline
Three people were killed and four or five injured in the July 26 shooting at Seattle Center, according to conflicting reports, and the mayor has ordered a review of how information reached the public.
Mass Casualty IncidentsAug 8, 2026, 12:19 a.m. ETSeattle, Washington, United States
One dead, seven injured in shooting outside downtown Seattle McDonald's
Police said a gunman opened fire outside a McDonald's in the busiest part of downtown Seattle during the evening commute on Jan. 22; no suspect has been identified.

Seattle Council Presses Police Chief on Bite of Seattle Shooting as Councilmember Publishes Minute-by-Minute Timeline