Authorities are still searching for a man who fell into a hot spring at Yellowstone National Park on June 7, although he is now presumed to be dead, according to a park spokesperson.
Witnesses say they saw a man in his 20s wander off a boardwalk and fall about 225 yards into a hot spring, the Casper Star-Tribune reports. Norris Geyser Basin, where the accident occurred, has been temporarily closed.
"At this time, rangers are treating this incident as a probable fatality because the victim has not been located," park spokesperson Jody Lyle said, according to CNN.
Yellowstone's website, the National Park Service, describes the basin as the hottest, oldest and most dynamic thermal area in the park. As such, officials must exercise extreme caution while conducting the search mission.
The boardwalks exist to protect people as well as to "preserve delicate thermal formations," according to the website.
"Scalding water underlies most of the thin, breakable crust in thermal areas," the site reads. "Pools may be near or above the boiling point of water and can cause severe or fatal burns."
This is the second incident involving hot springs at Yellowstone in less than a week. On June 4, a 13-year-old boy slipped and fell into a hot spring in the Upper Geyser Basin. He was flown to St. John's Medical Center in Jackson, Wyoming, with burns on his ankle and foot.
In May, members of a Canadian film crew were charged after they were seen venturing off the boardwalk and onto the Grand Prismatic Spring, according to the Casper Star-Tribune. However, they returned to Canada before they could be detained and are not going to be extradited.
Yellowstone's hot springs have injured or killed more people than any other natural feature in the park.