Reuters

LONDON–The International Association of Athletics Federations (IAAF) has asked the Court of Arbitration for Sport (CAS) to double Olympic 100 metres champion Justin Gatlin's four-year doping ban.

A U.S. arbitration panel suspended the 26-year-old American for four years in January after a positive test for the male sex hormone testosterone in 2006.

The panel ruled that the positive test was a second offence after Gatlin tested positive in 2001 for medication to treat Attention Deficit Disorder. He was reinstated by the IAAF in the following year.

"The IAAF's view is that Justin was publicly informed after he committed the first doping offence that any repetition could lead to a life ban," IAAF spokesman Nick Davies said on Monday. "We are not prepared to accept a reduction to four years."