Another large, concrete dock, similar to the one that washed up in Oregon this summer, has been found floating in the Pacific Ocean.

Fishermen first spotted the dock last week near the Hawaiian island of Maui and then the next day near Molokai.

A plaque written in Japanese was found on the dock, the fishermen told authorities.

It was predicted to come ashore around Oahu within a few days. However, it hasn't been spotted since.

The U.S. Coast Guard is warning other marine craft to be aware of the dock and more possible tsunami debris.

It's believed the dock was torn away by the earthquake and tsunami that hit Japan in 2011, but neither theJapanese consulate nor officials with the National Oceanic and Atmospheric Administration have been able to confirm it yet.

CBSNews obtained video of one of the fishermen walking across the surface of the dock as it bobbed up and down in the ocean waves. Here's that video:

The dock's appearance and length are similar to the one that appeared on Agate Beach in Newport, Oregon back in June. After turning into a tourist attraction, the 66-foot dock was stripped of living organisms and removed from the beach.

In addition to the dock sighting, a blue bin found on Oahu's eastern shore last Tuesday was confirmed as the first official piece of tsunami debris found in Hawaii. The bin was traced back to a seafood company in Miyagi prefecture.

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