NBA Commissioner David Stern said Tuesday that to his current knowledge, former league referee Tim Donaghy is the only league official being accused of placing bets on NBA games and providing information to others betting on NBA games.

"We think we have here a rogue, isolated criminal here," Stern said at a news conference. "I feel betrayed by what happened on behalf of the sport."

"I also understand [Donaghy] is the only referee alleged to have bet on NBA games and disclosed confidential information to others," Stern said, adding "Let me make it clear that's my current understanding."

"If that understanding changes tomorrow, I will so inform everybody," he added later.

Stern said the NBA is aware Donaghy is being accused of betting on games and providing information to others for the purpose of profitting off bets. Stern also said that he was unaware of any discussions of Donaghy potentially fixing games. He said the league was made aware of the allegations on June 20 and that Donaghy resigned on July 9.

"Suffice to say, we would have liked to have terminated him earlier, but our understanding was the investigation would best be aided if we did not terminate Mr. Donaghy," Stern said.