A Yellowstone National Park employee found what appears to be a partial human foot in a hot spring this week, park officials said.
The foot was still inside a shoe floating in the Abyss Pool, which is near the West Thumb Geyser Basin, Morgan Warthin, a public affairs officer for Yellowstone National Park, said in a statement.
An investigation has been underway since the foot was found Tuesday. No additional details were available Thursday afternoon.
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The Abyss Pool, in the southern area of the national park in Wyoming, is a 53-foot-deep hot spring, one of the deepest at Yellowstone.
Rangers temporarily closed access to the West Thumb Geyser Basin after the shoe was found; it has been reopened for visitors.