Edward Snowden: U.S. tracking down what he knows, where he is

(CBS News) Edward Snowden has already leaked information about the government tracking Americans' phone records, but U.S. officials still don't know how much other classified information he may have.

Sources: No signs Edward Snowden has left Hong Kong

Snowden, the National Security Agency contractor who left the agency's Hawaii base with a bag full the NSA's most closely guarded secrets has exposed programs that he claims violates Americans' privacy.

At the NSA's headquarters in Fort Meade, Md., officials were backtracking through Snowden's computer accesses to see what other secrets he may have left with, and how much damage he can still do.

Snowden was last seen in an interview in a Hong Kong hotel room before checking out. Snowden said then, "You can't come forward against the world's most powerful intelligence agencies and be completely free from risk because they're such powerful adversaries, that no one can meaningfully oppose them. If they want to get you, they'll get you in time."

So how will intelligence officials track him down?

Don Borelli, who was with the FBI before joining the Soufan Group, a private intelligence company, told CBS News, "There's an FBI legal attache in Hong Kong. There's no doubt that they -- that that person is making contact with his or her counterparts with the Security Service, say, 'Look, this is our plan. This is what we wanna do. We wanna keep tabs on this guy. We wanna know what you know'."

As a man on the run, Snowden may present special challenges. Having worked at the NSA as a contractor in computer security, and, he claims, the CIA overseas, he could use the trade craft he learned against the very institutions that taught him.

Borelli said, "The information that he has disclosed is the highest level of national security, and has the potential to cause exceptionally great danger. In addition, we don't know what other information he has with him and would disclose in public or disclose in private to our enemies."

And there's another possibility -- other nations like China, or Russia, that might be more than willing to offer an American on the run, a new home.

"If he manages to slip through the net and gets on the run," Borelli said. "Then it'll be a good, old-fashioned manhunt for as long as it takes to catch him."

However, CBS News senior correspondent John Miller said on "CBS This Morning," now isn't the time for a manhunt for Snowden, but rather a time for positioning. Miller explained, "The way this would go is, if I was the FBI agent assigned to the FBI's legal attache in Hong Kong while this was spinning up, headquarters would be on to me saying, 'Make some informal calls to your counterparts in Hong Kong and make sure they acquire this guy -- where is he -- get eyes on, that they're watching him and make sure that while we work through these charges and we can have those by Wednesday, maybe Thursday, that they don't lose him,' and that's probably pretty close to what's unfolded."

What Snowden hasn't revealed is perhaps more of concern that what he has -- and also where he is located, according to Miller. "Hong Kong is attached to mainland China and there's certainly a government relationship there. They're semi autonomous, but not totally autonomous. Are the Chinese looking at Snowden right now and saying, 'Why don't you come across the line and stay with us? You're looking for asylum.' The Russians, it's already been published, have already made that entreaty. We're watching the mechanics of justice turn (in the U.S.) here. They're trying to crank out a federal complaint with charges and ask the guys in Hong Kong acquire him, lock him up, extradite him, but in the meantime, a lot of other people in a lot of other governments are thinking about this right now, and saying, 'Gee, wouldn't it be nice to meet this guy and pick his brain?'"

Watch John Miller's full "CTM" report above.