The investigation follows last week's report by German broadcaster ARD alleging suspicious blood values.
The Chicago Marathon and the World Marathon Majors want their prize money back.
Kara Goucher and Steve Magness respond to Alberto Salazar's lengthy open letter.
Alberto Salazar responds to doping allegations made against him by the BBC, ProPublica, and former athletes and staff members.
Foreign agents cannot work in the country for at least six months while investigations are taking place.
How does Shalane Flanagan deal with the reality that the playing field may not be level?
New online tool provides the most up-to-date information on current and past drug cheats.
All aspects of the testing program will be coordinated by the IAAF Medical & Anti-Doping Department.
The reigning Chicago and Boston Marathon champion will be eligible to compete again on Oct. 30, 2016.
The Kenyan marathoner faces a ban from competition and elimination of her recent results.