Warholm had already broken the world record in JulyDates: 23 July-8 August Time in Tokyo: BST +8Coverage: Watch live on BBC TV, BBC iPlayer, BBC Red Button and online; Listen on BBC Radio 5 Live, Sports Extra and Sounds; live text and video clips on BBC Sport website and app.Norway's Karsten Warholm ran a stunning men's 400m hurdles race to obliterate his previous world record and take gold at Tokyo 2020.
Warholm, 25, finished in 45.94 seconds, while American Rai Benjamin was hot on his heels to win silver having also beaten the previous record.
Warholm had set the previous world record of 46.70 in Oslo in July.
Brazil's Alison dos Santos took the bronze medal with a time of 46.72.
It was tipped to be one of the most exhilarating races at the Games after Benjamin had come within five hundredths of a second of taking the then-world record in winning the US trials this summer.
Warholm established a strong lead when he raced out of the blocks but Benjamin threatened to claw him back before the Norwegian's final push for the line.
He roared with delight when he looked up at the screen to see his time, ripped his shirt in celebration and posed for photographs next to the new world record.
Former 110m hurdles world champion Colin Jackson told BBC TV: "When you talk about world records, this is up there with Usain Bolt's time of 9.58 seconds in the 100m and up there with Flo Jo's 10.49 seconds in the 100m.
"This is one of the most outstanding world records and I'm pretty sure that world record will outlive me."
