The girl’s sister, Sameeha Sultana, 13, was found unresponsive about an hour later at 7th Avenue, a block north. Rescue crews and the U.S. Coast Guard pulled her out of the water, and CPR was performed. She was taken to Jersey Shore University Medical Center, where she was pronounced dead.

Jersey Shore officials are pleading with the public to avoid swimming in the ocean when no lifeguards are around, especially now with Hurricane Erin.

Hurricane Erin brings swells to Florida. It's ideal for surfing but dangerous for beachgoers who see blue skies, but don't realize the dangers.

The swimmer was not identified by police, but a Coast Guard official said the victim was a young teenage girl.