Kenya's athletics federation has suspended the agents of marathon world record holder Dennis Kimetto and other top stars while it investigates the spike in doping among the country's runners. Athletics Kenya president Isaiah Kiplagat announced the decision Monday to suspend two athlete management companies, the Netherlands' Volare Sports and Italy's Rosa & Associati. AK did not make accusations against the companies, but said they would be suspended from working in Kenya for six months so that investigations can be carried out. Marathon world record holder Dennis Kimetto has seen his agent banned ahead of doping investigations . Rosa & Associati client Rita Jeptoo was banned for two years after testing positive for EPO . Kenyan authorities have previously blamed the rise in doping on the influence of foreign agents. Rosa & Associati represented women's marathon star Rita Jeptoo, who was banned for two years for the banned blood booster EPO. Volare Sports' clients include Kimetto and former marathon record holder Wilson Kipsang. London Marathon 2014 winner Wilson Kipsang is also a client of Dutch management company Volare Sports .
Kenya's athletic federation has banned runners' agents for six months .
Marathon world record holder Dennis Kimetto is a client of one of two banned management companies -  Volare Sports and Rosa & Associati .
Investigations into a doping spike among runners is set to take place .