Women's marathon olympics
Ethiopia's world champion Mare Dibaba took the bronze medal as her compatriot and race favourite Tigist Tufa pulled out before the halfway mark.
2012 olympic marathon results
London Marathon winner Sumgong, 31, finished in two hours 24 minutes four seconds to end a run of three straight silvers in the event for Kenya. Day-by-day guide to what's on. Latest medal table. Sumgong, who fell on her way to victory in London this year, and Kirwa pulled away from Dibaba in the final 2km in humid conditions in Rio.
Kenya-born Kirwa, who secured Bahrain's first ever Olympic silver and second medal of all time, failed to stay with Sumgong and both women looked physically exhausted after they crossed the line. At 35km I noticed that my other two team-mates had dropped off and that gave me the motivation to carry on. Women's marathon world record holder Paula Radcliffe.
The way Sumgong stumbled over the line shows that. Sumgong dominated that race mentally as well as physically. Subscribe to the BBC Sport newsletter , external to get our pick of news, features and video sent to your inbox. Watch every gold: Rio on the BBC - listings and channels. Great Britain's team for Rio Olympics newsletter - The best of the action delivered every morning.
British Olympic Association. International Olympic Committee.