IMPROVED anti-doping techniques led the International Association of Athletics Federations yesterday to announce that 32 adverse findings from 28 athletes have been discovered in retested samples from the 2005 and 2007 World Championships in Helsinki and Osaka respectively.

The athletes have been provisionally suspended. The process has been ongoing for years, and predates recent accusations by German TV and a UK newspaper. It is believed no British athletes are involved.

The latest 28 are in addition to nine athletes already sanctioned from earlier re-testing. Some of the 28 have already been sanctioned, but with legal process on-going, they can't be named.

The IAAF says the majority are retired. Significant figures may be involved, because the world body say they "will correct the record books and re-allocate medals as necessary".

Samples have been stored at the Swiss anti-doping laboratory in Lausanne as part of a 10-year partnership programme, and takes advantage of the increased statute of limitations available under the 2015 World Anti-Doping Code.

The IAAF pioneered systematic storage of samples for later re-analysis, and are retaining out-of-competition samples for further re-testing.

However, the Olympic discus champion, Robert Harting, led a group of German athletes who claim the IAAF cannot be trusted any more.