Guinness record for Nation's Triathlon?

Nearly 7,000 people have registered to participate in the Nation's Triathlon in Washington and organizers say the event could be a record breaker.

The Olympic distance triathlon held Sunday includes a 1.5 kilometer swim in the Potomac River, 40 kilometer bike course through downtown and a 10 kilometer run that ends on the banks of the Potomac River next to the Tidal Basin. The event benefits the Leukemia and Lymphoma Society.

Organizers say they could be recognized by the Guinness Book of World Records as the largest Olympic/International distance triathlon event in the country. That would beat the record 3,731 people at the Accenture Chicago Triathlon in Chicago in August 2006.

The event will close roads around the city through the early afternoon.

--The Associated Press