At least 111 people have been killed and another 220 injured following an earthquake on Monday night in north-west China, state media report.
The 5.9 magnitude quake struck Gansu province around midnight (16:00 GMT), bringing down buildings there and in Qinghai province to the south.
Emergency workers are braving freezing conditions to try and help people in the high-altitude area.
A second quake struck neighbouring Xinjiang hours later on Tuesday.
The damage from that 5.5 magnitude strike was not immediately clear.
Chinese President Xi Jinping has ordered full rescue efforts to Gansu, one of China's poorest regions.
Gansu lies between the Tibetan and Loess plateaus and borders Mongolia. The Monday night quake struck the Linxia Hui Autonomous Prefecture, an administrative region for China's Muslim Hui people.
The US Geological Survey (USGS) said it had a magnitude of 5.9 and depth of 10km (six miles).
Footage showed hospitals receiving patients, and rescuers searching through the rubble of collapsed buildings. Debris was also seen on the floors of rooms whose ceilings had partially collapsed.
The government has dispatched teams of rescue workers to assist local emergency crews.
In a statement, President Xi said, "all efforts should be made to carry out search and rescue, treat the injured in a timely manner, and minimise casualties".
State media agency Xinhua reported on Tuesday morning that 100 people had been killed and 96 injured in Gansu, while 11 were killed and 124 injured in Qinghai.
Power and water supplies have also been disrupted in parts of the region.
China sits in a region where a number of tectonic plates - notably the Eurasian, Indian and Pacific plates - meet, and is particularly prone to earthquakes.
Last September, more than 60 people were killed when a 6.6-magnitude quake hit the southwestern Sichuan province.
A 1920 earthquake in Gansu , which killed more than 200,000 people, is also recorded as one of the world's deadliest in the 20th century.
Source: BBC
BDST: 0840 HRS, DEC 19, 2023
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