Norway’s Karsten Warholm breaks men’s 400m hurdles world record

Norway’s Karsten Warholm broke Kevin Young’s 29-year-old 400m hurdles world record when he completed the race in 46.70 seconds in front of his home fans at the Diamond League meeting in Oslo on Thursday.Norway’s Karsten Warholm broke Kevin Young’s 29-year-old 400m hurdles world record when he completed the race in 46.70 seconds in front of his home fans at the Diamond League meeting in Oslo on Thursday.