KINGSTON, Jamaica (AP) — Jamaican Olympic sprinter Sherone Simpson was banned until Dec. 20 after testing positive for a banned stimulant, a disciplinary panel announced Tuesday.

The three-member panel of the Jamaica Anti-Doping Commission said it would soon release its reasons for issuing an 18-month ban, which begins from the June 21, 2013 sample collection date. The Olympic 4×100-meter relay gold and silver medalist, along with former 100-meter world record holder Asafa Powell, tested positive for oxilofrone at Jamaica’s national championships in June.

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