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Hong Kong (CNN)Twenty one ultra-marathon runners have died after extreme weather conditions hit a 100-kilometer (62-mile) mountain race in northwest China.
The high-altitude Huanghe Shilin Mountain Marathon began on Saturday morning in sunny conditions. But by 1 p.m. local time weather conditions had turned, with freezing rain, hail stones and gale winds lashing runners in Gansu County, according to the state-run Global Times.