Edward Snowden claims he has evidence that China, North Korea and Hong Kong have been targets of cyber-spying by the National Security Agency.
ABC News has learned that Snowden had four laptops full of information when he went to Hong Kong.
U.S. officials are concerned that Snowden may try to defect to China where he could reveal more secrets.
So far the U.S. has not filed any charges against Snowden and has made no effort to detain him.
