Adidas, the IAAF's biggest sponsor, has told the athletics' world governing body it is to terminate their sponsorship deal four years early.
The sportswear giant informed the IAAF of its decision — understood to be a direct result of the doping scandal sweeping the sport - last week.
Sources say the move will cost the IAAF and its commercial partner Dentsu tens of millions of dollars in revenue.
Neither Adidas nor the IAAF — the International Association of Athletics Federations - confirmed the split but both issued short statements. —BBC
