A tiger shark bumped a surfer off her board and bit the board at Ala Moana Beach Park, a scare for anyone in the water on Oahu's south shore.

• Ocean safety crews responded after reports of an aggressive shark estimated at 10 feet long.
• A woman lying on her surfboard was knocked off it, and the shark then bit the board.
• Other surfers in the water saw the attack happen.
• Warning signs went up along the beach.

Outlook: Signs and patrols will likely stay in place until the shark moves off, with swimmers urged to stay out of the water in the meantime.