UK Anti-Doping has sent two investigators to Kenya over allegations of doping at a training camp used by British athletes.
Kenyan doctors alleged that four unnamed British athletes received banned performing-enhancing drugs in the town of Iten, a high altitude training camp.
A joint investigation by the Sunday Times and German broadcaster ARD/WRD alleges evidence of blood-boosting drug EPO being taken in Iten.
UK Anti-Doping has reviewed the evidence presented to us by the Sunday Times and it is of grave concern and of significant interest.
UK Athletics (UKA) said that none of the doctors featured in the allegations were known to it or had treated its athletes.
According to the allegations, two doctors claim to have administered a series of EPO injections to a British athlete shortly before a major race.
In a statement, UK Athletics described the Sunday Times' allegations as "vague and unsubstantiated" and encouraged the newspaper to "provide full details of all of the individuals and information in its article as a matter of urgency so that the claims can be investigated in a timely manner".
It added: "None of the allegations as presented relating to British athletes accords with our experience.
"Nevertheless, we take any allegations of doping seriously and will as always cooperate fully with any investigation undertaken by Ukad or other anti-doping organisations".
It is alleged that the footage shows the medics claiming they were paid by British, Kenyan and other athletes to administer EPO.
According to the newspaper, the doctors provided medical notes and blood test results to show they had treated a British athlete for an injury.