MONTREAL (AP) – The World Anti-Doping Agency urged governments and sports bodies to accelerate the fight against drug cheats Wednesday, warning that recent high-profile cases may be only “the tip of the iceberg.”

WADA said the recent positive tests involving Tour de France champion Floyd Landis and Olympic 100-meter gold medalist Justin Gatlin underline the need to act decisively.

“With these recent cases, we may only be seeing the tip of the iceberg,” WADA chairman Dick Pound said.

The Montreal-based organization urged governments to ratify the UNESCO convention which makes the terms of the World Anti-Doping Code enforceable by law.

So far, only 15 countries have signed the convention. The treaty will only come into effect when 30 countries have signed. The next opportunity to ratify the convention will come at a a meeting of European sports ministers in Moscow in October.

Also Wednesday, Pound wrote a column in the Ottawa Citizen urging Landis and Gatlin to come forward, admit their mistakes and identify those who encourage or assist doping.

Regarding Landis, he wrote, “Tell it like it is, like it really is. Give everyone who has been subverted into the conduct that has exposed you the chance to clean it up, or take the risk that … your sport may be flushed down the toilet.

“Go after the enablers,” Pound wrote. “You will never, ever, have more credibility than you do today. They are the ones who wrecked you and who wrecked your sport. … Mr. Landis, exposed as he is now, could become the savior of his sport. Continued denial will only consign him to a life of ridicule and obscurity.

“As for Mr. Gatlin, I would give him the same free advice. Accept the consequences of your actions and use the experience to make your sport – and, in the process, yourself – a better man.”

Landis’s urine samples showed high levels of testosterone, as well as synthetic testosterone, after his remarkable Stage 17 victory. The American, who denies wrongdoing, could become the first Tour champion stripped of the title for doping.

Gatlin, who also tested positive for testosterone, faces a possible life ban. He also is contesting the results.

Pound scoffed at the “customary flow of denials.”

“Who knows,” he wrote. “USADA (the United States Anti-Doping Agency) may subscribe to a suggestion that both athletes, in separate sports, were ambushed by a roving squad of Nazi frogmen and injected against their will with the prohibited substances.”