No one was believed to be on the boats at the time, and no injuries were reported. Two other boats were damaged, too.
Two boats caught fire and sank Tuesday night at a marina on Harbor Island, Seattle fire officials said.
At least two other boats in the fire in the 1300 block of Southwest Spokane Street were damaged, said Seattle Fire spokeswoman Corey Orvold.
No one was believed to be on the boats at the time, and no injuries were reported. Calls came in to dispatch starting around 8:30 p.m., according to the Seattle 911 dispatch site.
Investigators will determine the cause of the blaze.
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Crews fought the fire on land and on a fireboat, though with some difficulties, Orvold said.
“Access with carrying heavy hoses down to where they fought the fire … [was] definitely an issue,” she said.
Stefan Krzeszowski, who has a boat in the marina, watched the firefighting unfold. He said he saw crews pull one boat out of its slip to put out the fire.
“But it burned all the way down and sank,” he said.
A portion of nearby railroad tracks was temporarily closed, and access to nearby docks was restricted until further notice, said Seattle Fire spokeswoman Lt. Sue Stangl.
Federal agencies including the Environmental Protection Agency and the Coast Guard will investigate the environmental impacts of the sunken boats, Stangl said.
She said such boats can pose risks to the environment.
“Whatever is on a boat, if the boat does sink, those things are going to be released in the water.”