Two-time world champion Karsten Warholm broke a 29-year-old world record in the 400m hurdles, the longest-standing record in men’s track.

The Norwegian clocked 46.70 seconds at a Diamond League meet in Oslo on Thursday. American Kevin Young held the record of 46.78 from the 1992 Barcelona Olympics.

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Karsten Warholm breaks 29-year men's 400m hurdles world record | NBC Sports

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