US federal agents investigating Lance Armstrong: Report

US federal agents are investigating disgraced former Tour de France champion Lance Armstrong for crimes including obstruction, witness tampering and intimidation, ABC News reported on Wednesday.

Citing an anonymous source, ABC News said the current probe is focused on different charges from those previously investigated in a federal probe that was dropped last year.

US Attorney Andre Birotte, who led the prior investigation, said he had no plans to press charges despite Armstrong's recent doping admissions, but he did not definitively rule out such actidope,on.

Birotte's investigation was centered on doping, fraud, conspiracy and Armstrong's denials of such crimes when he was the lead rider in the extremely successful government-funded US Postal Service Team.

"Obviously we've been well aware of the statements that have been made by Mr Armstrong and other media reports," Birotte said, referring to Armstrong's bombshell doping confession to chat show legend Oprah Winfrey last month.

"That has not changed my view at this time. Obviously we'll consider -- we'll continue to look at the situation," Birotte told reporters in Washington.

The ABC News source, quoted on condition of anonymity, said: "Birotte does not speak for the federal government as a whole. Agents are actively investigating Armstrong for obstruction, witness tampering and intimidation."