German freelance journalist Hajo Seppelt said on Thursday an underground television investigation in Kenya had convinced him there was a widespread doping problem in the east African nation.

Allegations about doping in Kenya, which along with Ethiopia has dominated middle and long-distance running, were first aired by the German national television broadcaster ARD before last year's London Olympics.

Last month, Kenya's three-time world 3,000m steeplechase champion Moses Kiptanui told Reuters doping took place in Kenyan running camps and three Kenyan athletes were banned after positive dope tests.