Bolt saddened by Jamaican doping
The athletes – four men and one woman – are not thought to be any of the Olympic medal winners from last summer’s Games in Beijing.
“I’m not sure who it is yet, I’m sure it’s not me so I’m not really worried,” Bolt said after winning the 100 metres at last night’s Aviva London Grand Prix at Crystal Palace. “If it’s someone from my group I don’t know, I can’t comment.