IAAF chief is hit by criticism
World 400 metres champion Christine Ohuruogu has accused IAAF president Lamine Diack of "not knowing what the hell is going on" in athletics.
Ohuruogu's criticism came after Diack, the head of the sport's world governing body, said athletics faced a "crisis" over doping allegations.
Ohuruogu, a former Olympic champion who won her second world title in Moscow in 2013, branded the comments "uncalled for".
Ohuruogu said: "It's very hard to promote our sport when he doesn't know what the hell is going on."