This shoe washed up on the Tacoma, Wash., tideflats last week, containing a human foot. (Pierce County Sheriff)

Authorities are seeking more information about another small human foot that has washed ashore in Washington state.

The right foot was still inside a boy's size 6 Ozark Trail hiking boot, and likely belonged to a juvenile or small adult, police spokesman Mark Fulghum said Tuesday in Tacoma, about 40 kilometres south of Seattle and 225 kilometres south of Vancouver.

Fulghum said the boots were sold in Wal-mart stores from 2004 to 2005.

The foot, found early last week, is believed to have floated in from either the Puyallup River or Puget Sound. It's the second human foot to wash ashore in Washington state in four months.

In late August, a right foot believed to be that of a woman or child washed up on a beach in Whidbey Island, about 100 kilometres south of Vancouver.

It's not yet known if the cases are linked or if they have any connection to cases in B.C., where seven feet have washed ashore in the past four years, Fulghum said.