In what has been deemed a suicide by witnesses and park officials, searchers are still looking for the body of a Utah resident who jumped off an observation deck overlooking the Yellowstone River Tuesday afternoon.

Witnesses say that the man, identified as 20-year-old Nicholas Mostert, was standing on the observation deck when he jumped into the river and traveled downstream and down the 308-foot Lower Falls, which feeds into the Grand Canyon of Yellowstone.

Doug Madsen of Yellowstone's Search and Rescue Team retrieves and item of the victim's clothing from the Yellowstone River. (NPS Photo by Doug MacCartney)