Washington, Feb 2: Olympic golden boy Michael Phelps has apologised for photos showing him using a bong, an implement used to smoke cannabis.
The pics published in Britain's News of the World were taken in November at a University of South Carolina house party.
"I engaged in behaviour which was regrettable and demonstrated bad judgment," Usmagazine.com quoted Phelps as saying.
"I'm 23 years old and despite the successes I've had in the pool, I acted in a youthful and inappropriate way, not in a manner people have come to expect from me.
“For this, I am sorry. I promise my fans and the public it will not happen again," he added.
The U S Olympic Committee said that it was "disappointed in the behaviour recently exhibited by Michael Phelps."
But 'Michael has acknowledged that he made a mistake and apologized for his actions.' "We are confident that, going forward, Michael will consistently set the type of example we all expect from a great Olympic champion," it added.