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.
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.