Responders arrived at Sandy Hook's Beach B, located in the Gateway National Park Area, around 4:30 p.m., park spokeswoman Daphne Yun tells Daily Voice.
Of the six pulled from the waters, one refused medical attention, one was sent to Jersey Shore Medical Center, and three were rushed to Monmouth Medical Center.
The teen boy, whose identity was not released as of Monday morning, was pronounced dead at the hospital.
Gateway National Park's EMTs and officers were assisted in the rescue by Highlands and Sea Bright responders.
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