Twenty-one people were killed when extremely cold weather struck during an ultramarathon in rugged Gansu province in northwestern China, sparking public outrage on Sunday over the lack of contingency planning.
The 100-km (62-mile) race began on Saturday from a scenic area at a bend in the Yellow River known for its sheer cliffs and rock columns. The route would take runners through canyons and hills on an arid plateau at an elevation of over 1,000 metres (3,300 feet).
The race kicked off 9 a.m. (0100 GMT) with runners clad in t-shirts and shorts under overcast skies, according to photographs posted on the social media account of the Yellow River Stone Forest area in Jingtai, a county under the jurisdiction of Baiyin city.
Around noon on Saturday, a mountainous section of the race was hit by hail, freezing rain and gales that caused temperatures to plummet, officials from Baiyin told a news briefing on Sunday.
A massive rescue effort was initiated, with over 1,200 rescuers dispatched, assisted by thermal-imaging drones, radar detectors and demolition equipment, according to state media.
A landslide following the severe weather also hampered the rescue work, said officials from Baiyin, about 1,000 km (620 miles) west of the Chinese capital Beijing.
A total of 172 people took part in the race. By Sunday, 151 participants had been confirmed safe. A last missing runner was found dead at 9:30 a.m. on Sunday, bringing the death toll to 21, state media reported.
Jingtai county saw a low of 6 degrees Celsius (43 degrees Fahrenheit) on Saturday excluding wind chill.