State Department of Land and Natural Resources Dan Dennison said in an email alert that the incident happened around 9:30 a.m. Saturday on Kukio Beach near Hualalai.
A 25-year-old man was airlifted by Hawaii County Fire Department firefighters to a hospital with multiple injuries to his hand and leg.
His condition was not immediately known.
Dennison says per standard procedure, beach closure signs warning visitors will be displayed for a mile on either side of the incident for the rest of the day.
He says a decision will be made Sunday morning whether to reopen the beach.
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