"Apparently someone stole a plane from SeaTac?" wrote one Twitter user.
Pierce County Sheriff's Office says that a 29-year-old suicidal man acted alone and crashed the aircraft. He is reported to be a Pierce County resident.
The plane crashed on Ketron Island, which had 17 inhabitants, per the 2010 Census, and 10 families.
It also said "this was not a terrorist incident".
A Horizon Air Bombardier Dash 8 Q400, reported to be hijacked, flies over Fircrest, Washington, the USA, before crashing in the South Puget Sound, August 10, 2018 in this still image taken from a video obtained from social media. He told air traffic controllers that, "Those guys will rough me up if I try and land there". "Can this thing do a black flip thing?".
"This is probably jail time for life, huh?" said Rich.
Ground control advises him to wait. Moments later they heard an explosion. The jets were not involved in the crash, it said. The tiny island is accessible only by ferry.
If you are anxious about your or someone else's mental health, the best place to get help is your GP or local mental health provider.
It said that the F-15 pilots kept the "Q400 out of harm's way and people on the ground safe".
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Alaska Air reports that a Horizon Air Q400, which is a twin propeller airplane, was stolen.
Horizon Air is part of Alaska Air Group and operates shorter routes throughout the US West.
Video from the scene shows the plane, which had no passengers on board, fly upside down while being tracked by fighter jets. We'll move quickly to correct the record and we'll only point to the best information we have at the time. Based on video from KIRO 7, the crash has started a forest fire on the island. "We have multiple 911 calls, over 30, reporting a fireball".
The F-15s had been scrambled from Portland and had "made it within a few minutes of theft of plane", the sheriff's office said. We have police boats, we have everybody responding. "We're just trying to find a place for you to land safely". "We are sending resources and people".
Witnesses reported seeing fighter jets intercept the plane, then the Q400 crashing soon after into the Puget Sound, a body of water leading to the ocean just off Seattle.
A reader board shows a number of flights delayed at Sea-Tac International Airport.
"What we have is that someone stole a plane", Troyer said.
"My pilot speaking", her tweet began.
Air traffic controllers and pilots could be heard discussing a "ground stop" and dealing with a backlog of aircraft.