Honolulu Emergency Medical Services and Ocean Safety responded to three patients at Haleiwa Boat Harbor who were apparently bitten by a shark(s) just after 10:40 a.m.
The three people, two men and a woman, were part of a tour group and were snorkeling when they were bitten.
Honolulu EMS treated all three patients on scene but all refused transport to an emergency room.
A female resident, 24, received an injury on her right hand. Her father, 57, who is visiting from California had an injury to his right arm.
A 31-year-old visitor from Brazil received an injury on his right shoulder.
The Visitor Aloha Society of Hawaii (VASH) is assisting the injured visitors.