LONDON (AFP) - Kenya's Priscah Jeptoo surged clear to win a sombre London Marathon on Sunday, as runners paid tribute to the victims of the deadly bomb attacks at the Boston Marathon.
Jeptoo, the silver medallist at last year's London Olympics, streaked away from the women's field to claim victory ahead of compatriot Edna Kiplagat and Yukiko Akaba of Japan.
London Olympic champion Tiki Gelana collided with men's wheelchair athlete Josh Cassidy at a drinks station after 52 minutes, and the Ethiopian's challenge never recovered.
As Gelana toiled, Jeptoo led a three-woman breakaway that also featured world champion Edna Kiplagat and 2011 Berlin Marathon champion Florence Kiplagat. Florence Kiplagat slowly fell back and her namesake Edna could not keep pace with Jeptoo either after the 28-year-old ran the 21st mile in a time of five minutes and 11 seconds.
Jeptoo completed the race's final stages alone and raised her arms in triumph as she crossed the finish line in front of Buckingham Palace in a time of 2hr 20min 13sec.
In the men's race, British Olympic star Mo Farah helped set the early pace before dropping out, as planned, after an hour.
The 5,000m and 10,000m champion at last year's London Games is preparing to compete over the full distance next year, but he said he had struggled with the demands of marathon running.
"The pace is not a problem. The biggest challenge is picking up the right drink and I think I made a mess of it," Farah said. "I've learnt the biggest lesson of my life, really. If I come here next year and make a mess of it, it'd be hard to deal with, so it's opened my eyes."
Australia's Kurt Fearnley took the honours in the men's wheelchair race after pipping Marcel Hug of Switzerland in a sprint for the line.
Britain's David Weir, who was bidding for a seventh London Marathon title, was level with Hug as the leading racers entered the final straight but ultimately finished fifth.
American Tatyana McFadden claimed victory in the women's wheelchair event in a course record time to follow up her success in the equivalent race in Boston.
Earlier, a 30-second period of silence was observed prior to the start of the elite men's and mass races, in tribute to the three people killed and around 180 injured in Monday's twin bomb blasts in Boston.
Competitors also sported black ribbons in memory of the Boston victims, while the police presence was increased by 40 percent.
Despite security fears, organisers said 700,000 people took to the streets of London to watch the race on a day of blue skies and bright sunshine in the British capital.
US police arrested one suspect in the Boston bombing on Friday after his brother and fellow suspect was killed in a shootout.