File photo shows Chen Ying, Chinese peacekeeper in South Sudan, stands guard in South Sudan. The two seriously injured peacekeepers, Chen Ying and Huo Yahui, were airlifted to Beijing aboard a specialist medical rescue plane sent by the Chinese military for specialized treatment and operations. Two Chinese peacekeepers under the UN Mission in South Sudan were killed and four others injured on last Sunday evening as the fighting between government and anti-government forces continued. [Photo/Xinhua]