Norway's Karsten Warholm breaks world record to win gold in men's 400m hurdles

​By a Staff Reporter: Karsten Warholm has won a spectacular men's 400m hurdles final in a new world record time of 45.94. Rai Benjamin of the USA came second to win silver (46.17), while Brazil's Alison dos Santos wins bronze (46.72). Both Warholm and Benjamin went under the previous world record, with the Norwegian almost a second under the former world best (46.70).Warholm started out of the blocks like a man on fire, moving to the front from the early stages and looking for all the world as if he would saunter to victory. But the USA's Rai Benjamin had other ideas, sprinting level with the Norwegian down the final straight. It looked, momentarily, as if Warholm would fade, but as he jumped aggressively over the final hurdle, he found a new lease of life, charging over the line to destroy his own world record