LOS ANGELES (AP) -- Attorneys for Lance Armstrong have demanded an on-air apology from "60 Minutes" after the head of Switzerland's anti-doping laboratory denied allegations the seven-time Tour de France winner tested positive for performance-enhancing drugs at the 2001 Tour de Suisse.

In a letter sent Wednesday to CBS News Chairman and "60 Minutes" executive producer Jeff Fager, lawyer Elliot Peters said the May 22 segment about Armstrong was built on a series of falsehoods, and he accused the reputable CBS show of sloppy journalism.

"In the cold light of morning your story was either extraordinarily shoddy, to the point of being reckless and unprofessional, or a vicious hit-and-run job," Peters wrote. "In either case, a categorical on-air apology is required."