Police in the southern US state of Arkansas say 16 people have died after flash flooding hit two campsites.
Rescuers are still searching for those trapped by the flooding and emergency workers say more than three dozen people are unaccounted for.
The National Weather Service said 7.6in (19.3cm) of rain had fallen overnight before the floods.
Two helicopters are taking part in the search, in a remote, mountainous area in the state's south-west.
The search operation is focused on campsites along the Little Missouri and Caddo rivers.
Police spokesman Bill Sadler told US network CNN: "We believe there are still individuals trapped in the area.
"The primary mission of the Arkansas state police working with the local authorities right now is to get the living out of that area and locate the dead."
Officials were bringing in a refrigerated truck to act as a temporary morgue, he said.
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