Two coaches - who were stripped of their Tokyo 2020 Olympic Games accreditation for their involvement in allegedly forcing Belarusian sprinter Krystsina Tsimanouskaya to board a flight home to Minsk - are under investigation by the Athletics Integrity Unit (AIU).

Double Olympic gold medallist Derartu Tulu has accused Ethiopian runners of chasing “quick money” and turning to performance-enhancing drugs to help them.

Mexican race walker María Guadalupe González Romero has been banned for a further four years for tampering with the anti-doping process.

The Athletics Integrity Unit (AIU) has acknowledged the upholding of its decision to make Ukraine’s Nazar Kovalenko ineligible to compete in the men’s 20 kilometres race walk that has just concluded in Sapporo.

Nigerian sprinter Blessing Okagbare has been provisionally suspended and will miss the remainder of Tokyo 2020 after testing positive for human growth hormone.

Swiss sprinter Alex Wilson has been ruled out of Tokyo 2020 after the Court of Arbitration for Sport (CAS) reinstated a provisional suspension.

A group of 10 Nigerian athletes have been declared ineligible for the Olympics by the Athletics Integrity Unit (AIU) because they were not tested rigorously enough in the run-up to Tokyo 2020.

Eight qualifying performances for the Tokyo 2020 Olympic Games have been rejected following investigation by the Athletics Integrity Unit (AIU), with the athletes concerned being denied places.

The Athletics Integrity Unit (AIU) is planning to carry out 800 drugs tests on track and field athletes competing at the Tokyo 2020 Olympics.

Alex Quiñónez, Ecuador’s 2019 world 200 metres bronze medallist, has been provisionally suspended for anti-doping whereabouts failures.

Russian high jumper Danil Lysenko has had a six-year ban confirmed by the Court of Arbitration for Sport (CAS), with two years suspended due to assistance provided by the athlete in cases against former Russian Athletics Federation (RusAF) officials.

In what has been described as a "genuinely exceptional" case, Russia's former world 110 metres hurdles champion Sergey Shubenkov has been cleared of any wrongdoing after an adverse finding reported in December.

South Africa’s Luvo Manyonga, who overcame a crystal meth addiction before going on to win the 2017 long jump world title in London, has received a four-year ban for whereabouts failures.

Shelby Houlihan, the American record holder in the women's 1500 metres and 5,000m, is set to miss the Tokyo 2020 Olympic Games after she was given a four-year doping ban.