Fighter pilots from the Air National Guard of Washington and OR flew alongside the plane, according to an emailed statement from Gov. Jay Inslee.
The sheriff's office said that "this is not a terrorist incident" and that the pilot was a mechanic from an unknown airline.
The plane thief "is confirmed a suicidal male", Troyer wrote.
"The central government in Kabul said the situation in Ghazni was under their control, but we managed to contact officials in Ghazni who said that fighting was underway in areas surrounding Ghazni", said the parliamentarian. The Pierce County Sheriff's Department and the Coast Guard dispatched rescue vessels to the scene.
Alaska Airlines says it was aware of one of its planes taking off in an unauthorized way from the airport.
A Horizon Air Bombardier Dash 8 Q400, reported to be hijacked, flies over Fircrest, Washington, the US, before crashing in the South Puget Sound, August 10, 2018 in this still image taken from a video obtained from social media.
Two F-15s pursued the plane but were not involved in the crash, the sheriff said.
The man was a resident of Pierce County, Wash., and "acted alone", the Pierce County Sheriff's Department tweeted. Video showed fiery flames.
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Later, an official encouraged him to land the plane, to which the man replied: "I don't know, man".
Flight were delayed but normal operations have since resumed at Sea-Tac Airport.
Witness Royal King told The Seattle Times he was photographing a wedding when he saw the low-flying turboprop being chased by two F-15s.
According to a tweet from Alaska Airlines, the plane is a Horizon Air Q400.
"We can see evidence of fire on the hillside here on this island", he said in a reporter standup.
She confirmed no other crew or passengers had been on the 76-seater Q400.
"It was unfathomable, it was something out of a movie", he told the newspaper.