A metal cylinder bigger than a pickup truck has washed ashore in Washington and experts are working to determine if it came from Japan.
A ranger found it Tuesday on Long Beach at Cape Disappointment State Park.
The Washington State Marine Debris Task Force is investigating whether it was swept out to sea by the March 2011 tsunami in Japan.
Investigators said because the 19-foot-long pipe doesn't have any markings, an official determination about its origin will be difficult to determine.
Washington Fish and Wildlife Department workers are checking for any invasive species in the seaweed clinging to the cylinder.
A Department of Health official examined the cylinder Tuesday and found no radioactive contamination above normal background levels.
A 66' long dock found Dec. 18 on a remote beach near Forks, WA, was determined to be tsunami debris from Japan.
A 188-ton dock from Japan washed ashore on the Oregon coast in Newport in June 2012. Crews dismantled it in August.
Japan's government estimated that the 2011 tsunami swept about 5 million tons of debris into the Pacific Ocean. Around 70 percent of that is believed to have sunk quickly.
Copyright 2013 KPTV-KPDX Broadcasting Corporation. All rights reserved. The Associated Press contributed to this report.
Debris from the Japan tsunami continues to wash ashore on Oregon and Washington's coastlines. More>>