Jamaica's world 100 metres record holder Usain Bolt has sounded another warning to his Olympic rivals with an impressive winning time of 19.76 in the 200 metres at the London Grand Prix athletics meeting.
Bolt, who set the year's best time of 19.67 two weeks ago, broke the UK All Comers record of 19.84 held by American world champion Tyson Gay, who would be one of Bolt's main rivals if the Jamaican decides to run in the 100 at the Beijing Games.
