South Whidbey Fire and EMS marine crews are responding to a float plane crash west of Mutiny Bay off Whidbey Island, the department tweeted just before 4 p.m. Sunday.
One person died in the crash, according to South Whidbey Fire.
A recovery effort is underway to find the nine additional bodies.
The plane was flying from Friday Harbor to the Seattle area, South Whidbey Fire said.
According to the United States Coast Guard, nine adults and one child were onboard the plane.
North Whidbey Fire marine units, Kitsap County Fire marine units, Everett Fire marine units, Naval Air Station Whidbey Island Search & Rescue, and USCG units are assisting in the response.
This is a developing story.
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