Firefighters rescued the surviving runners who participated in the Yellow River Stone Forest Mountain Marathon after extreme weather hit north-central China.

In the video, shot in the city of Baiyin in Gansu Province on May 22, firefighters were conducting search and rescue operations, while a helicopter and a drone were used to aid on-ground efforts.

Reportedly the event began at 10:00 am on May 22. However, within a few hours, there were reports of participants calling for help on social media, due to freezing weather conditions.

Severe weather struck the 100-kilometre (60-mile) cross-country race, and as of 9:30 am on May 23, a total of 151 participants were retrieved, eight of whom were treated for minor injuries in the hospital. Another 21 were found dead.

The case is under investigation. The video was provided by local media with permission.

甘肃马拉松事故现场 直升机无人机参与搜救
5月22日，甘肃白银马拉松越野赛遇极端天气，多人死伤。截至5月23日上午9时30分，参加百公里越野赛172名参赛人员中的151人已经确认安全，其中8人轻伤在医院救治，情况稳定。另有21名参赛人员找到时已失去生命体征。
据了解，甘肃省委省政府已成立事件调查组，对事件原因进行进一步深入调查。
由于赛段内地形地貌复杂，加上夜间气温再度下降，很多地区的通信信号很差，搜救难度大，当地已采用直升机参与搜救。
另据甘肃方舟救援队队员介绍，由于山上下过雨和冰雹，救援难度很大。3时，现场队员用热成像无人机找到一名疑似遇难者。（视频由甘肃台提供）