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The IAAF says Olympic 1,500-meter champion Asli Cakir Alptekin of Turkey has been charged with doping and could lose her gold medal.

The Russian track and field federation says Olympic discus silver medalist Darya Pishchalnikova has been banned for 10 years for doping and will be stripped of her medal.

Italy's anti-doping tribunal has banned former Olympic race walk champion Alex Schwazer for 3.5 years.

The U.S. Anti-Doping Agency says 2004 Olympic 200-meter champion Shawn Crawford has been suspended for two years for not giving full information about his whereabouts for out-of-competition drug testing.

Track and field's governing body is investigating 17 suspected doping cases uncovered by the biological passport program.

Six athletes from Russia and Belarus, including three gold and two silver medalists, have been caught for doping in retests of their samples from the 2005 track and field world championships in Helsinki.

Sport's highest appeals court has upheld the lifetime doping ban for Jamaican sprinter and former world relay champion Steve Mullings.

The IAAF says several track athletes who competed at the 2005 world championships have tested positive for doping following re-testing of their samples.

Former Olympic shot put champion Udo Beyer has admitted doping, saying in a documentary that it was his personal decision and that, still, he won the gold medal in 1976 in Montreal because he was "the best" and not because he doped.

Track and field's governing body says Colombian runner Diego Palomeque has been suspended for two years after failing a drug test at the London Olympics.

South Africa's track and field federation says 11 athletes were sanctioned for doping in 2012, calling it a "very high number" and a "troubling statistic."

German long-distance runner Simret Restle-Apel has been banned for two years after testing positive for the blood booster EPO.

British javelin thrower and coach Ian Burns has been banned for four years for multiple doping violations.

The Italian Olympic Committee has requested a four-year doping ban for former Olympic race walk champion Alex Schwazer.

The IAAF says two female athletes whose doping cases emerged at the London Olympics have been suspended by their national federations.

Russian race walker Sergei Morozov has received a lifetime ban for a second doping offense.