Summary
At least 111 people have been killed and more than 250 injured in the 5.9 magnitude quake that struck rural Gansu province in north-west China
Rescuers are braving freezing weather - with temperatures below -13C - to search for survivors
The government has dispatched teams of rescue workers to assist local emergency crews
China's leader Xi Jinping has ordered full rescue efforts
Power and water supplies have been disrupted in parts of the region
A second quake has been reported in Xinjiang province