London 2012 chairman Sebastian Coe will look into why 100 metres world champion Usain Bolt was prevented from taking a skipping rope through security.

Jamaican sprint star Asafa Powell has claimed he has given so much blood to the drugs testers he will not be at his best for the 100 metres final.

Anti-doping chief Dick Pound has warned sport’s drug cheats the net is starting to close in on them.