YELLOWSTONE NATIONAL PARK -

A search is underway for a 22-year-old Georgia man who was swept down a dangerous river in Yellowstone National Park.
    
The National Park Service says Darien Latty was last seen about 7:30 p.m. Monday in the Yellowstone River near Tower Junction on the north side of the park.
    
It says Latty was among three park concession employees who were floating the Lamar River with inner tubes. Floating the Lamar River is prohibited by park regulations due to safety concerns.
    
Shortly after reaching the confluence of the Lamar and Yellowstone rivers, two of the men got out of the water.
    
However, Latty was seen being carried downstream by the rushing water, without either an inner tube or life jacket.
    
Initial search efforts failed to turn up any sign of Latty.