LAUSANNE, May 27 -- The 2012 London Games samples were retested and 23 new doping failures were reported by the International Olympic Committee (IOC) on Friday.

Names of the dopers were not disclosed by IOC, which only said the 23 were from six countries and five sports at the London Games.

The IOC have already detected the 2008 Beijing Games with 32 cases were revealed after 454 samples were retested. A total of 265 samples from the London Games were retested.