Olympic medallist Jenny Simpson is making “encouraging improvement” in hospital after collapsing at an event in Raleigh, North Carolina.

The 39-year-old American was pacing a mile group at a Sir Walter Miler pop-up event on Tuesday when she reportedly collapsed and needed CPR.

Her employer Fleet Feet says she is recovering well.

They said, external: “Jenny received immediate medical attention and was transported to a nearby hospital. Fleet Feet CEO Joey Pointer was also at the event, and stayed with Jenny at the hospital throughout the night as her family traveled to be with her early Wednesday morning.

“While Jenny remains under medical care, she has shown encouraging improvement and continues to exhibit the strength and resilience that have long defined her.

“True to form, she has already asked about her mile time and whether she won.”

Simpson, who retired from competitive running at the end of the 2024 season, won gold in the 1500m at the 2011 World Championships and a bronze medal at the 2016 Olympic Games in Rio.

Simpson also won silver medals in the 1500m at the 2013 and 2017 World Championships.