Warning signs were posted at White Plains Beach on Thursday after a shark chomped down on a stand-up paddlers board.
It happened just before 3 p.m. at least 200 yards offshore.
The shark was estimated to be between 8 and 11 feet long.
There were no injuries reported.
Federal lifeguards posted signs and cleared the water after the incident. They'll be out on the beach again on Friday to assess whether it's safe for beachgoers.
Copyright 2017 Hawaii News Now. All rights reserved.
PHOTOS: Zoo's new 'reptile house' opens
PHOTOS: Sand sculptures in Waikiki
PHOTOS: Hawaiian Air welcome first Airbus A321neo
PHOTOS: Honolulu City Lights Christmas tree arrives
SLIDESHOW: Black Friday 2017 Deals