LONDON — Usain Bolt delivered a rebuke to those who questioned whether he really suffered an injury in his farewell race at the World Athletics Championships by revealing details of his hamstring tear on Thursday.

The Jamaican, stung by speculation that he had pulled up in the anchor leg of the 4 x 100 meters relay final in London on Saturday because he was too far behind to win the race, said the injury would need three months of rehabilitation.

Accompanied by an x-ray of the injury to his left hamstring, the eight-times Olympics gold medalist was also adamant in social media posts that he never cheated his fans.

The 30-year-old explained on Twitter: "Sadly I have tear of the proximal myotendineous junction of biceps femoris in my left hamstring with partial retraction. 3 months rehab.

"I don't usually release my medical report to the public but sadly I have sat and listened to people questioning if I was really injured.

"I have never been one to cheat my fans in any way & my entire desire at the championship was run one last time for my fans. Thanks for the continued support my fans and I rest, heal and move onto the next chapter of my life #Love&LoveAlone."

The posts on Twitter were removed shortly after they had been posted.

Bolt had been three meters down on the two leaders as he took on the last leg of the relay, which was won by Britain, only to pull up sharply and fall to the ground, coming to a halt after a forward roll on the track.

He speculated on Sunday that the injury, which ended a wretched final championships for him after he only managed to win bronze in the individual 100 meters the previous weekend, might have been caused by having a long wait before the race.

Bolt, who won 19 global championship golds, is widely considered the finest sprinter in athletics annals.

Russian triple jumper Pystykh banned for doping

Russian triple jumper Anna Pystykh was on Friday handed a four year doping ban and stripped of her 2007 World Championship bronze medal, the Court of Arbitration for Sport (CAS) announced.

The now 36-year-old Russian finished fourth in the triple jump in Osaka but inherited third after the disqualification of Chrysopiyi Devetzi of Greece, also for doping. The 2007 bronze medal could now go to Slovenian Marija Sestak, who originally finished fifth.

Pystykh's positive result for anabolic steroids at the 2007 World Championships was revealed in a retest of samples. All Pystykh's results from July 6 2013 to her provisional suspension on December 15 2016 have also been wiped from the record books, CAS added, after she failed a second test for an unspecified banned substance.

Fredericks' temporary ban upheld by IAAF tribunal

In Berlin, an athletics disciplinary tribunal upheld on Thursday a ban on former Namibian sprinter and IAAF Council member Frankie Fredericks pending an investigation into potential ethics violations. Fredericks, a multiple Olympic sprint silver medalist and a rising star among international sports administrators until this year, was temporarily banned in July.

He is being investigated by the Athletics Integrity Unit (AIU) over payments he received from Papa Massata Diack, the son of former IAAF president Lamine Diack, on the day Rio de Janeiro won the vote to host the 2016 Olympics. Fredericks has repeatedly denied any wrongdoing. He admitted having received money from Massata Diack, but said it was payment for legitimate work he had done.

"Mr. Fredericks appealed against the order for provisional suspension and his appeal was heard by an enlarged panel of the Disciplinary Tribunal," the AIU said in a statement. "Having heard from both parties, the enlarged panel agreed with the AIU's submissions and it declined to lift the order for provisional suspension."

Earlier this year Fredericks, an International Olympic Committee member, stepped down as head of the team evaluating bids to host the 2024 Olympics. He also removed himself from the IAAF (International Association of Athletics Federations) task force investigating doping allegations in Russia, after the corruption allegations involving himself surfaced. — Reuters