US Olympic CEO Promises Further Action on Lochte and Three Other Swimmers

— -- U.S. Olympic Committee CEO Scott Blackmun announced today that further action is coming in the case of star swimmer Ryan Lochte and his three teammates whose story of a robbery at gunpoint grabbed headlines around the world.

Blackmun at a daily media briefing gave no specifics on what possible disciplinary action may be taken, but he made no effort to hide his frustration with the matter.

"They let down the other athletes; they let down Americans; and they let down our hosts in Rio," Blackmun said of Lochte, a 12-time medalist, and the other three swimmers. "We are going to have further action on this when we get back to the United States."

The Olympic committee CEO said, “The lesson learned [from the Lochte incident] is that you’re on a big stage. The things that you do are going to be magnified, and the mistakes that you make are going to be really … they’re going to have a light shine on them in a way that’s going to make it very, very difficult for you to overcome.”

Lochte originally said last weekend that he and his teammates were the victims of an an armed robbery.

But, according to police, the four swimmers vandalized a bathroom after a night of partying and armed guards confronted them and asked them to pay for the damage.

In an interview with NBC's Matt Lauer yesterday, he said he "over-exaggerated" the story.

ABC News' Jim Ryan contributed to this report.