China says it is pursuing three alleged U.S. operatives accused of carrying out cyberattacks on Chinese infrastructure during the Asian Winter Games.

China accused the United States National Security Agency of launching "advanced" cyberattacks during the Asian Winter Games in February.

Chinese security officials said Tuesday they had implicated three US "secret agents" in cyberattacks during February's Asian Winter Games in the northeastern city of Harbin, offering a reward for information on the alleged spies.