BRUSSELS, Belgium (AP) -- Track and field's world governing body dismissed doping allegations against former Olympic sprint champion Maurice Greene, throwing its support behind the man who once held the 100-meter world record.

Greene also denied the accusations, which were made by a witness in a U.S. government investigation into sports doping and reported this past weekend in the New York Times.

"None of this is new," International Association of Athletics Federations spokesman Nick Davies told The Associated Press. "There is no reason to take action against Maurice."

Davies said the IAAF would continue to use Greene as one of its goodwill ambassadors to promote the sport in the run-up to the Beijing Olympics.