Employee takes off in empty airplane from Seattle's airport, crashes
There was no indication that the incident was an act of terror, the Pierce County Sheriff's Department said on Twitter.
Alaska Airlines said that it was aware of an unauthorized take-off of a Q400 twin-engine turboprop airplane operated by its sister carrier Horizon Air.
Video footage on social media showed a large plane flying above the Seattle area with an F-15 following it.
"Okay, this insane. A pilot on the plane in front of us just went rogue and took off on an empty plane bypassing orders from the tower," tweeted Ben Schaechter, a passenger on an airplane that was taxiing to take off before the incident.
Local media showed video of a fire from the crash on Ketron Island in Puget Sound.
The Bombardier Q400 turboprop airplane is designed for shorter-distance flights and can seat 76 passengers, Alaska Air said on its website.
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)