Eloy Quiros Alvarez (3rd L), General Commissioner of Spanish Judicial Police, and Yang Dong (4th L), Director of the Bureau of Criminal Investigation of the Public Security Ministry of China, attend a ceremony to transfer the evidences seized in the operation "The Wall" in Madrid, Spain, June 1, 2018. The Spanish National Police on Friday held a ceremony to transfer the evidences seized in the operation "The Wall" to China. Police force from China and Spain carried out a joint anti-fraud operation called "The Wall" in late 2016. (Xinhua/Guo Qiuda)