Cycling: 4 new doping cases of black market drug

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Aigle, Switzerland • The International Cycling Union has announced four more cases of riders testing positive for a banned black market drug.

The UCI says it provisionally suspended four Costa Rican riders this month who tested positive for "GW501516" at the Tour of Costa Rica last December. They are Vargas Barrantes, Mudarra Segura, Morales Castillo and Villalobos Azofeifa.

The drug is subject of a World Anti-Doping Agency health warning.

Last week, the UCI suspended European Championship track silver-medalist Valery Kaykov pending an investigation by the Russian cycling federation

Kaykov was tested on March 17, four days before WADA warned athletes not to use the endurance-boosting substance because of toxic side effects.

WADA was advised in 2009 to add the drug to the list of banned doping substances.