US cycling star Lance Armstrong has announced he will no longer fight drug charges from the US anti-doping agency, ahead of a Friday deadline.

In a statement, the 40-year-old maintains he is innocent, but says he is weary of the "nonsense" accusations.
The US anti-doping agency (USADA) now says it will ban Armstrong from cycling for life and strip him of his seven Tour de France titles.
Armstrong retired from professional sport in 2011.
USADA alleges he used banned substances as far back as 1996, including the blood-booster EPO, steroid and blood transfusions.
Armstrong sued in federal court to block the charges but lost.