Bolt: 'I have to stay vigilant to remain drug free'

Jamaican sprinter Usain Bolt has revealed that he has to stay "constantly vigilant" to remain drug free.

Athletics has been blighted by doping scandals in recent months after athletes, including the former 100m world record holder Asafa Powell, tested positive for banned substances.

The multiple Olympic champion says he makes sure he works with people he trusts as ITV News' Paul Davies reports:

Read: Sporting credibility at stake in corrosive doping scandal

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Bolt reconsiders retirement plan

Six-time Olympic champion Usain Bolt is reconsidering his retirement after the Rio 2016 Olympic Games and says he is likely to compete for a further year after that