An athlete competing in the Ironman U.S. Championship in the river between New York City and New Jersey has died after having a medical problem during the swimming portion of the grueling triathlon.

Swimmers in the Hudson River as part of the Ironman competition
Swimmers in the Hudson River as part of the Ironman competition

A publicist for the race organizers says the competitor "experienced distress" during a 2.4-mile swim in the Hudson River at the start of the all-day competition.

The swimmer was taken to a hospital, but did not survive. The organizers say the cause of death is unknown. An autopsy is planned.

New York City police say the contestant was a 43-year-old man.

Contestants in the race were following their swim in the Hudson with a 112-mile bicycle ride through the suburbs, and then a 26.2-mile marathon that was to end at Manhattan's Riverside Park.
(Copyright 2012 by The Associated Press.  All Rights Reserved.)

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