Three female weightlifters from Kazakhstan have been stripped of gold medals from the 2012 London Olympics after failing retests of their doping samples.
The Kazakh lifters were among a total of eight more athletes sanctioned by the International Olympic Committee on Thursday after their stored samples came back positive for steroids.
A female weightlifter from Belarus was stripped of a bronze medal. Also disqualified were two other Belarusian lifters, a Russian hammer thrower and a Russian pole vaulter. The case against a Russian wrestler who won a silver medal was dropped because he has since died in a car crash.
The IOC stores doping samples for 10 years so they can be reanalysed when improved testing methods become available.
The IOC recorded a total of 98 positive cases in recent retests of samples from the London Games and 2008 Beijing Olympics.