IAAF president Sebastian Coe has confirmed reports in German media which said the governing body's integrity unity had received claims of doping against Kenyan athletes ahead of the World Championships.
Television channel ZDF alleged at least two athletes had taken performance enhancing erythropoietin (EPO), which boosts the capacity of blood to carry oxygen, before the meeting begins on September 27 in Doha.
"I know the AIU (Athletics Integrity Unit) is following up on some accusations that have been made in the German media. I'm sure they (AIU) will report back as soon as they've established the facts to the IAAF," Coe said on Monday.
ZDF published secret film footage of a man and a woman in the process of receiving EPO via an injection.
An anonymous doctor admitted to treating eight runners in the documentary, adding that "no-one dopes directly before competitions, here they're using EPO while training."
"Despite the good work which has been done by ADAK, WADA, AIU and AK, we are aware that in the past, there have been extremely malicious & unfounded allegations against the Athletics fraternity in Kenya whose intentions have been to belittle the vicious war against the doping."
A former ADAK employee said "they hide results from certain athletes, so that the runners can't get suspended."
Brett Clothier, the head of the AIU, responded by saying: "These are serious accusations and we're not so naive to say that these problems or corruption don't exist in Kenya."