Transgender women have been banned from competing in the female category at international athletics events.
The decision was made by World Athletics today in order to 'prioritise fairness and the integrity of the female competition before inclusion'.
Seb Coe, the governing body's president, also confirmed athletes from Russia and Belarus would continue to be excluded from competition, including the Olympics, due to the war of Ukraine.
That puts World Athletics in direct conflict with the International Olympic Committee, who are exploring a pathway for Russian and Belarusians to compete at Paris 2024 as 'neutrals'.