Canadian men claim relay bronze, breaking 20-year-old national record - The Globe and Mail
London Olympics 2012: Oscar Pistorius finishes last in 4 x 400 final
US men and women both fumble batons
Record broken, medal won and job done for men's 4x100m athletics team - Team Canada - Official Olympic Team Website
Tokyo Olympics end on a high for US men with victory in 4x400m, REPORT
VIDEO: Allyson Felix's 11th Olympic medal comes in US 4x400 relay
American runner finishes Olympic relay lap on broken leg
Track star Allyson Felix makes history with gold in final Olympic race in Tokyo
U.S. Runner Finishes Olympic Relay Leg on Broken Leg – NBC Bay Area
US runner finishes Olympic relay lap on broken leg, Sports
Dallas' Sha'Carri Richardson anchors U.S. women's relay win at world championships
World Record gold for Rosey Effiong in USA mixed relay