The Ethiopian collided with Canadian wheelchair racer Josh Cassidy as she went to get a drink.

NPR: Kebede Wins London Marathon Amid Tight Security

In the women's elite race, there was controversy early on when 2010 wheelchair winner Josh Cassidy dropped out after a collision with Olympic champion runner Tiki Gelana.

BBC: London Marathon: Runners and crowds mark Boston attack

Weir held off Canada's Josh Cassidy, who pipped him to the line in April's London Marathon, to win the event for the fourth time in 44:49 while Woods chalked up her third triumph in 52:59.

BBC: Ethiopian Haile Gebrselassie wins the Great North Run