Olympics-Athletics-Warholm wins men's Olympic 400m hurdles gold in world record time

TOKYO - Karsten Warholm of Norway won the Olympic men's 400 metres gold medal on Tuesday in a world record time of 45.94 seconds.

Rai Benjamin of the United States took silver, with Brazilian Alison dos Santos taking bronze.

(Reporting by Mitch Phillips; Editing by Sudipto Ganguly.)