Six NBA referees have been disciplined for violating the league's anti-gambling rules, the New York Daily News reported Sunday, citing unnamed sources.

The punishments come in the wake of the scandal this summer involving Tim Donaghy, who has pleaded guilty to two felony charges after admitting he bet on NBA games that he officiated.

After Donaghy's actions came to light, the NBA began investigating all its officials, the newspaper reported.

The league found a variety of infractions, as minor as visiting casinos, the newspaper reported. None of the refs' actions were even close to Donaghy's, the newspaper reported.

"There were some violations," NBA commissioner David Stern said from Europe, the Daily News reported. "But they are not hanging crimes."

Donaghy, who resigned in July, faces a maximum of 25 years in prison for his crimes.

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