Flomena Chepchirchir, a 2:23 Kenyan marathoner, broke her left femur after colliding with another runner during the Toronto Marathon on Sunday, Canadian Running reports.

The accident occurred as the elite women neared the first aid station near the 5K mark. They were running on the left side of the road, and the aid station was on the right side. According to Canadian Running, as the group drifted across the street, Chepchirchir made contact with a male entrant running down the middle of the street. Chepchirchir fell and caught her foot on a streetcar track. A man who was running near the group told Canadian Running he heard "a cracking sound."

The man who collided with Chepchirchir told Canadian Running "there was clearly some confusion about where the water station was." The man, who requested anonymity, said he dropped out of the marathon after the accident.

Chepchirchir, 33, has personal bests of 1:08:06 for the half marathon and 2:23:00 for the marathon; she ran the latter in finishing second at the 2013 Frankfurt Marathon. She is in a Toronto hospital and will have an unspecified operation, according to Canadian Running.

The incident can be seen at about the 1:02 mark of this replay of the streaming of the race.

Scott Douglas Scott is a veteran running, fitness, and health journalist who has held senior editorial positions at Runner’s World and Running Times.

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