Fifteen men and women fell victim to heatstroke Wednesday while running in an “ekiden” relay marathon in Showa Kinen Park in Tachikawa, western Tokyo, shortly after noon. Thirteen were taken to the hospital.

Temperatures in Tachikawa rose to 29.8 degrees at noon at the height of the annual West Tokyo division of the All Japan Citizens’ Circuit Marathon. Although the event is held at about the same time every year, the weather was especially hot for mid-September this year, organizers said.

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