The head of Kenyan athletics says he hopes the nation's doping problem remains manageable after two more marathon runners were banned for positive tests.
Three other long-distance runners were suspended for using banned substances last month and there have been claims of a widespread problem. Athletics Kenya secretary general David Okeyo said: "The number is growing and we are not happy about the statistics. We only hope the culprits remain at a manageable level and the [doping] issue is not widespread."
The most recent bans, for two years, have been imposed on Salome Jerono Biwott and Jynocel Basweti Onyancha. Wilson Erupe Loyanae, Nixon Kiplagat Cherutich and Moses Kiptoo Kurgat have also been suspended.