International Association of Athletics Federations has announced that two Kenyan athletes have been suspended after testing positive for doping at the World Championships in Beijing.

Joyce Zakary, 29, and Koki Manunga, 21, who competed in the 400m and 400m hurdles, were tested at their team hotel on 20 and 21 August and have accepted provisional bans after "targeted tests" by the governing body.

Zakary set a national record of 50.71 seconds in the 400m heats on Monday but unfortunately, could not start in her scheduled semi-final on Tuesday.

Manunga finished sixth in her heat of the 400m hurdles after recording a time of 58.96.

"Athletics Kenya (AK) has already met with the IAAF and the athletes involved, and has begun investigating the situation which led to these results," said the national governing body. "Follow-up action will be taken in Kenya."

Thirteen Kenyan athletes are currently serving suspensions for doping offences.

Earlier this month, the World Anti-Doping Agency (Wada) announced it would begin an "urgent" investigation into allegations of widespread doping in athletics.

The Sunday Times published data from 5,000 athletes, which it says reveals an "extraordinary extent of cheating".