Jamaican sprint star Powell and Sherone Simpson, confirmed that they had tested positive for a banned stimulant at their country's national trials for Moscow.

Asafa Powell, Sherone Simpson Fail Dope Tests

, one of the fastest men in history, sent shockwaves through the blue riband 100m on Sunday when he failed drug tests.

Jamaican sprint star Powell, a former 100m world record holder, confirmed that he had tested positive for a banned stimulant at his country’s national trials for Moscow.

However, the 30-year-old strenuously denied any wrong doing.

Olympic champion and world record holder (9.58sec) has gone faster than Gay, whose best of 9.69sec he shares with Yohan Blake of . Powell is the fourth fastest man of all time with 9.72sec.

World record holder Bolt’s best time over 100m this season is 9.94sec set in Kingston in June.

Powell, took to Twitter to confirm his failure.

“I will confirm that a sample I gave at the National Trials in June has returned ‘adverse findings’,” he said.

“The substance oxilofrine was found, which is considered by the authorities to be a banned stimulant.

“I want to be clear that I have never knowingly or wilfully taken any supplements or substances that break any rules. I am not now nor have I ever been a cheat.”

Female sprinter and Olympic silver medalist Simpson also failed a drug test at the event.

“This is a very difficult time for me. I was notified on July 14, 2013 that my urine sample taken at the National Senior Championship, June 21, 2013 after the 100m finals returned a positive analytical finding for a stimulant oxilofrine (methylsynephrine),” Simpson said in a statement,

“As an athlete, I know I am responsible for whatever that goes into my body.” …I would not intentionally take an illegal substance of any form into my system,” Simpson added.

“I want to sincerely say to my family, Paul Doyle (agent), MVP track club, fellow athletes former sponsors and the rest of Jamaica that l am deeply sorry for any hurt or embarrassment this positive test may of caused,” said Simpson, who was involved in the historic Jamaican gold, silver/silver finish in the 100m at the Beijing Olympics.

“Thanks to all who have been supporting me, I really appreciate it at this time. My team and I will try to do everything we can to get this issue dealt with as best as we can. “

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