According to a report released today by GMWatch, China destroyed three shipments of GM corn imported from the US.

The first two shipments are referenced on the website of the Zhuhai Entry-Exit Inspection and Quarantine Bureau, confirming that two illegal GM corn shipments entered Wanzai Port in Zhuhai City on May 7th, and were subsequently destroyed:
Recently, during inspection and quarantine of imported food from USA by a certain company, the Wanzai Office of Zhuhai Inspection and Quarantine Bureau (in Guangdong Province in the south of China) detected two shipments containing GM corn products, which are not in compliance with China's "Entry and Exit of Genetically Modified Products Inspection and Quarantine Management Approach". The Office destroyed the two shipments of corn according to the provisions.*
The existence of a third shipment was confirmed in a May 19th article appearing on news.china.com.cn titled, "Harbin intercepted a total of 115 kgs of GM corn seeds, which will be destroyed":

Recently, the Harbin Entry-Exit Inspection and Quarantine Bureau intercepted inbound mail of 21 cartons of corn seeds from USA, totaling 115 kgs, which were detected as GM seeds. This is the first time that the Heilongjiang Provincial Inspection and Quarantine System has intercepted inbound corn seeds containing GM ingredients. These corn seeds will be destroyed. * ........................learn more)

http://www.activistpost.com/2013/05/breaking-news-china-destroys-3-us.html