A plane has crashed near Sea-Tac airport in Seattle after being stolen by an airline worker and perused by F-15 fighter jets.
"There are still a lot of unknowns surrounding tonight's tragic incident of a stolen Horizon Airline plane from Sea-Tac Airport", Inslee said.
The 29-year-old man, who has not been identified, was suicidal and appeared to have acted alone, the Pierce County Sheriff's Department said on Twitter, adding the employee was probably killed in the crash.
Horizon Air is a division of Alaskan that flies shorter routes in the western US.
John Waldron, who took dramatic video of the stolen plane flying in a loop, told CNN that he was out for an evening stroll when he saw the two fighter jets following the turboprop aeroplane.
"I'm not quite ready to bring it down just yet", the pilot says.
The Pierce County Sheriff's Office reported the situation was not a terrorist incident.
"I was getting prepared to run just in case", he said.
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Local media described the man who stole the plane as a mechanic. Video showed fiery flames amidst trees on the island, which is sparsely populated and only accessible by ferry. The Pierce County Sheriff's Department and the Coast Guard dispatched rescue vessels to the scene. Earlier, the Alaska Airlines reported "unauthorized take-off' of the plane at Seattle-Tacoma International Airport in Washington".
He also wondered aloud whether Alaska Airlines would give him a job piloting if he could pull off a landing.
"Didn't really know it until now", the man said, according to audio from air traffic controllers.
Royal King of Mukilteo was photographing a wedding at Lake Steilacoom when he saw a low-flying plane and two F-15 fighter jets trailing it.
A plane flies past a control tower at Sea-Tac International Airport Friday evening, August 10, 2018, in SeaTac, Wash.
An air traffic controller refers to the man as "Rich" and advises him to stay over water. The airport said operations have since returned to normal.
Black smoke was spotted pouring from the crash site.
"It was unfathomable, it was something out of a movie", he said. 'The smoke lingered. You could still hear the F-15s, which were flying low'.