IOC President Kirsty Coventry is shown on a computer screen as she speaks at a live-streamed press briefing Thursday from Lausanne, Switzerland, about the ban on transgender athletes in women's events. Leon Neal/Getty Images hide caption

Leon Neal/Getty Images

The International Olympic Committee (IOC) will ban transgender athletes from competing in women's events, based on the results of mandatory genetic screening.

The IOC announced the policy on Thursday after a yearslong review. It will take effect starting at the 2028 Summer Games in Los Angeles.

"At the Olympic Games, even the smallest margins can be the difference between victory and defeat," said IOC President Kirsty Coventry in a video statement.…