U.S. win gold in women's 4x400 relay read more at here http://spinonews.com/index.php/component/k2/item/655

Felix held off a late challenge by Jamaica's Novlene Wiliams-Mills to claim her third medal of the Rio Olympics having won gold in the 4x100m relay and silver in the individual 400m.

The U.S. gold streak in the event started at the 1996 Atlanta Games.

The United States maintained their iron grip on the Olympic women's 4x400 meters relay when they held off Jamaica for their sixth straight victory in the event to give anchor Allyson Felix her sixth career gold.

The U.S. finished in 3 minutes 19.06 seconds. Jamaica took silver in 3:20.34 and Britain the bronze in 3:25.88.

Her team mate Courtney Okolo set the stage for the win by grabbing the lead in the opening stage and the U.S. never relinquished it, pushed by Jamaica but well clear of the rest of the field by the halfway point.

Natasha Hastings and Phyllis Francis rounded out the U.S. team.

Jamaica's silver was their fifth straight medal in the event, following silver in 2000 and bronze in 2004, 2008 and 2012 while Britain claimed their first medal since 1992.