The Cedar Grove Police Department said a group of people went into the water in Cedar Grove, New Jersey, despite seeing "no trespassing" signs posted and warnings about the risks of swimming in the area.
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They say someone went into the water and failed to resurface.
Police, firefighters and many surrounding agencies responded to the scene after 5:15 p.m.
An 18-year-old male was pulled from the water unconscious.
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He was pronounced dead at the hospital.
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