The competition was held in hot running conditions, reaching 88 °F (31 °C) that afternoon, and some of the 27,000 registered runners opted to take up the organizers' offer to defer their entry until the 2013 race.Defending women's champion Kilel was not the fastest entrant in her section: Russia's Galina Bogomolova and Ethiopians Aselefech Mergia and Mamitu Daska had better personal bests.Upon reaching the first major uphill section after 17 miles (27 km), Caroline Rotich, Diana Sigei Chepkemoi and Genet Getaneh progressively fell behind the leading pace.A volunteer attempting to assist the leading runners by handing them some water actually disrupted the pack at 18 miles (29 km) and defending champion Caroline Kilel dramatically slowed soon after, eventually dropping out at 40 kilometres (25 mi).[2][4] The final section of the race at Heartbreak Hill saw Firehiwot Dado fall out of contention, leaving just a Kenyan trio of Sharon Cherop, Georgina Rono and Jemima Jelagat Sumgong to battle out the medal positions.
Wesley Korir
mid-race in the leading pack of the 2012 Boston Marathon