U.S. braces for more tsunami debris, but impact unclear

This photo, taken by the Oregon Park and Recreations Department Thursday, June 7, 2012, shows an exotic mussel attached to a dock float that washed up on Agate Beach Tuesday near Newport, Ore. State authorities are considering how to dispose of the millions of marine creatures that hitchhiked across the Pacific Ocean aboard the dock float torn loose from a Japanese fishing port by the 2011 tsunami so they will not compound the problem of invasive species.(AP Photo/Oregon Parks and Recreation Department, ho)