A German speedskater is under a doping investigation for allegedly using ultraviolet light to enhance the oxygen flow in her blood and other athletes may be involved.
The German anti-doping agency refuses to identify the athlete. She has been under investigation since May.
The athlete came to the attention of investigators during an inquiry into a doctor in the Olympic training center in the city of Erfurt. The doctor extracted blood from athletes, treated it with ultraviolet light and then injected it back into the athletes. The procedure is illegal.
Cyclists and track and field athletes may also have been involved.