(R-L) U.S. Immigration and Customs Enforcement (ICE) Deputy Director Kumar Kibble, U.S. Customs and Border Protection (CBP) Deputy Commissioner David Aguilar and Chinese Embassy's Deputy Chief of Mission and Minister Deng Hongbo sign a paper during an ancient Chinese artifacts returning ceremony in Washington D.C., capital of the United States, March 11, 2011. U.S. government officials on Friday returned to China over a dozen of invaluable ancient Chinese artifacts which were seized by law enforcement officers from illicit traffickers in 2010. [Xinhua]