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A major piece of tsunami debris is heading toward the Washington coast.

Sen. Maria Cantwell's office says the floating debris appears to be another dock.

It was spotted by fishermen about 16 miles off the Washington coast, 45 miles north of Grays Harbor.

The size of the dock is not known.

A 66-foot dock landed on the beach in Newport, Ore. last June. In recent months, the Northwest has seen tons of debris float ashore from the 2011 earthquake and tsunami in Japan.

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