U.S. Anti-Doping Agency head Travis Tygart said this week that he had received death threats over his agency's investigation of Lance Armstrong. In an interview published in France's L'Equipe on Monday, Tygart said he went to the FBI after receiving three threats against him. "I accept being accused, mistreated. That's me, the public face of USADA. Am I a target? I won't shirk my responsibility," Tygart said. USADA and Tygart are scheduled to provide evidence of Armstrong's doping to the International Cycling Union by the end of the month.