Hawaii authorities on Tuesday say they have referred 33 people to U.S. law enforcement after the group allegedly harassed a pod of wild dolphins in waters off the Big Island.

It’s against federal law to swim within 50 yards (45 meters) of spinner dolphins in Hawaii’s nearshore waters. The prohibition went into effect in 2021 amid concerns that so many tourists were swimming with dolphins that the nocturnal animals weren’t getting the rest they need during the day to be able to forage for food at night.

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It’s been six years since the championships were last held inside the IU Natatorium at IUPUI. 800 of the best swimmers across the country will compete.