Search and rescue teams continued efforts Tuesday to locate a hiker still missing after a flash flood struck Grand Canyon National Park in Arizona over the weekend, leaving two others dead.

The National Park Service confirmed the identities of the two men who died after being swept away along the canyon floor on Saturday as John Giusti, 46, and Brent Rosenkranz, 42, both residents of Granbury, Texas. A third hiker, Timothy Allen Smith, 53, has not been found, and search crews remained active in the flood-affected areas.

Initial reports immediately after the flood suggested as many as 30 people were unaccounted for. That number decreased over the following days as authorities confirmed survivors and located other hikers. As of Tuesday, Smith was the only individual officially listed as missing.

Justin Cully, chief park ranger at the Grand Canyon, noted on Monday that some hikers might have been in the flood zone without officials’ knowledge. Since permits are not required for daytime trail use, the total number of people exposed to the flash flood could be higher than recorded.

The National Park Service said it was possible additional victims had not yet been identified. "Search and rescue operations are ongoing, with teams continuing efforts to locate the missing hiker and account for anyone else who may have been in the affected area at the time of the flood," the agency stated.

Over the weekend, emergency responders evacuated 82 survivors, most by helicopter, according to Dave Black, the Park Service incident commander.

The flood was caused by heavy rains that rapidly transformed Bright Angel Creek, a significant tributary running from the park's North Rim down to the Colorado River, into a torrent of mud, rocks, and debris. This surge destroyed trails, footbridges, and infrastructure, creating hazardous conditions in the park’s canyon floor region.

Authorities remain engaged in search and rescue efforts while investigating the full extent of the incident and assessing the safety of remaining park areas.