One person has been killed and nine people remain missing, including a child, after a floatplane crashed in Puget Sound in Washington state, the US Coast Guard says.
The agency said in a press release that the plane was flying from Friday Harbor, a popular tourist destination in the San Juan Islands, to Renton, a southern suburb of Seattle.
Four Coast Guard vessels, a rescue helicopter and an aircraft were involved in the extensive search, along with nearby rescue and law enforcement agencies.
Two vessels were to continue searching during the night and air patrols would resume at first light on Monday, the Coast Guard said late on Sunday.
The crash was reported at 3.11pm on Sunday. The Coast Guard said one body had been recovered and nine people were still missing. The cause of the crash was unknown, authorities said.
The plane went down in Mutiny Bay off Whidbey Island, roughly 50km northwest of downtown Seattle and about halfway between Friday Harbor and Renton.
The National Transportation Safety Board said the plane was a de Havilland DHC-3 Otter, a single-engine propeller plane.
Floatplanes, which have pontoons allowing them to land on water, are a common sight around Puget Sound, an inlet of the Pacific Ocean.
There are multiple, daily flights between the Seattle area and the San Juan Islands, a scenic archipelago northwest of Seattle that draws tourists from around the world.
These aircraft, which also fly between Seattle and Vancouver, British Columbia, frequently travel over Seattle and land in Lake Washington, not far from the city's iconic Space Needle.