Xinjiang special police take part in a military training in Xinjiang Uygur Autonomous Region on Feb. 19, 2013. With temperatures below negative 20 degrees Celsius, the training is aimed at enhancing police enforcement abilities to combat tough climates as well as cope with high stress and physical pain. In China, special police units are responsible for combating terrorism, maintaining public security, and dealing with violent crimes and emergencies. [Photo/Xinhua]

Xinjiang special police take part in a military training in Xinjiang Uygur Autonomous Region on Feb. 19, 2013. With temperatures below negative 20 degrees Celsius, the training is aimed at enhancing police enforcement abilities to combat tough climates as well as cope with high stress and physical pain. In China, special police units are responsible for combating terrorism, maintaining public security, and dealing with violent crimes and emergencies. [Photo/Xinhua] 

Xinjiang special police take part in a military training in Xinjiang Uygur Autonomous Region on Feb. 19, 2013. With temperatures below negative 20 degrees Celsius, the training is aimed at enhancing police enforcement abilities to combat tough climates as well as cope with high stress and physical pain. In China, special police units are responsible for combating terrorism, maintaining public security, and dealing with violent crimes and emergencies. [Photo/Xinhua] 

Xinjiang special police take part in a military training in Xinjiang Uygur Autonomous Region on Feb. 19, 2013. With temperatures below negative 20 degrees Celsius, the training is aimed at enhancing police enforcement abilities to combat tough climates as well as cope with high stress and physical pain. In China, special police units are responsible for combating terrorism, maintaining public security, and dealing with violent crimes and emergencies. [Photo/Xinhua] 

Xinjiang special police take part in a military training in Xinjiang Uygur Autonomous Region on Feb. 19, 2013. With temperatures below negative 20 degrees Celsius, the training is aimed at enhancing police enforcement abilities to combat tough climates as well as cope with high stress and physical pain. In China, special police units are responsible for combating terrorism, maintaining public security, and dealing with violent crimes and emergencies. [Photo/Xinhua]