[Martin Savidge, Cnn Anchor:] You're in the CNN NEWSROOM. I'm Martin Savidge. It's great to be with you. Our attention tonight is on Guantanamo Bay, Cuba. The U.S. detention center there is still open nearly six years after President Obama signed an order to shut it down. But the number of people up there is shrinking. The Pentagon has now confirmed that four men were sent back to their home country of Afghanistan. That's in addition to six others who were released earlier this month. About 800 terror suspects in all have been held at Guantanamo connected to the U.S.-led war on terror. After this release, it will remain at 132. I want to bring in Robert Baer. He is a former CIA officer and CNN intelligence and security analyst. Bob, who are these men that have been sent back to Afghanistan this morning and what do we know about them?
[Robert Baer, Cnn Intelligence And Security Analyst:] Well, as you said, Marty, they're suspects. There's no evidence that they've killed Americans. They were in the wrong place at the wrong time. They may have connections with terrorist groups but it's not something that military prosecutors can prove and at this point there's absolutely no reason why we can't let them go. And they will go back and some of them almost certainly will join a terror group and eventually be caught again or proved to be terrorists and there's just nothing you can do about it. Just like the police when they arrest suspects that they can't bring a case against, they have to release them, they go on to commit another crime. I don't see any difference at all.
[Savidge:] Do you see or whose job will it be to try to keep track of these suspects? I presume somebody is going to try to keep tabs on them.
[Baer:] They'll end up on lists, you know, their biometrics, any indicia, digital indicia associated with them they'll keep track of them. They'll go back to Afghanistan, where who knows what's going to happen to them then. A lot of these people frankly will just go back to peaceful lives but, again, let's not get excited about this right now. Some of them will join terrorist groups.
[Savidge:] Now, we know that Congress has struck down the outright closure of Guantanamo in the new defense bill but that doesn't stop the release of more detainees. Can President Obama shut it down without Congress approving?
[Baer:] Well, I hope they shut it down. After all we are going to normalize relations with Cuba and I could see at one day that that base is at least jointly administered with Cuba, you know, if things go well. We have to come to a system, the world does, to deal with these jihadists a way to put them behind bars and, you know, put them out of the business.
[Savidge:] I wanted to ask you real quick, there is a report now, and I'm switching gears now to ISIS. ISIS barely has banned devices with GPS tracking. Smart move on their part? Belated? What do you think?
[Baer:] No. These guys are very good. You know, what surprised me about ISIS is they've gone to mobile wi-fi. I mean, they only go for a couple minutes. They have simply looked at the Snowden documents that were leaked and they have found a hole in our coverage. National security agency, you know, a lot of young kids from Europe and the United States are showing up there that understand their way around computers and communication system. They're getting better and it's really a tough catch-up game for the national security agency.
[Savidge:] Yes. I think many people have been impressed with sophistication. Even when it comes to just the video presentation. Bob Baer, thanks very much. We always look forward to your insights. Moving to North Korea, moving on that is, the state-run news agency there today blasted what it called America's childish investigation. That concluded North Koreans were behind that Sony computer hacking. Hackers broke into Sony servers and they even threatened to attack movie theaters that screened "The Interview," that's a comedy film about an assassination plot on North Korea leader Kim Jong-un. The Guardians of Peace, the hackers accused of carrying out the attack issued a new message today taunting the FBI and congratulating the bureau for its investigation. Experts say the hacking required a high level of technical knowledge and North Korea may have had some help. Here's CNN's Brian Todd
[Brian Todd, Cnn Correspondent:] The cyber forensic evidence all points to North Korea, according to the FBI. The computer code, algorithms, the IP addresses but that's not necessarily a clear path to Pyongyang.
[Scott Borg, U.s. Cyber Security Group:] It's all circumstantial evidence that can be faked.
[Todd:] Scott Borg's cyber security group monitors the skill levels of hackers across the globe. Despite North Korea's efforts to develop sophisticated army of hackers he says there were elements in the Sony attack that went beyond their skill level.
[Borg:] The biggest one is that they were able to carry on with activities inside Sony's network for so long without being spotted. Moving possibly terabytes of data without anyone noticing requires a lot of skill. Opening documents all over the place in order to download them and have no one notice requires quite a bit of skill.
[Todd:] And they just didn't have that even recently?
[Borg:] That's right. Earlier this year there was no sign of that level of skill.
[Todd:] Borg believes Kim Jong-un's regime may have outsourced at least some of the Sony hack but to whom?
[Borg:] I think the most likely, this was hacking talent that volunteered to help them or criminals that they hired. Or someone inside of Sony who provided them with all kinds of inside access.
[Todd:] U.S. investigators have evidence that hackers stole the computer credentials of a Sony system administrator to get inside access but could another government have helped North Korea? One analyst says another U.S. enemy may be involved.
[Unidentifed Female:] There are signs that suggest Iran may indeed have helped. Because they have worked together on missile development for many years because Iran has been a major client of North Korea weapons.
[Todd:] CNN reached out to Iranian officials about that. They didn't respond. The White House maintains North Korea acted alone.
[Barack Obama, U.s. President:] We've got no indication that North Korea was acting in conjunction with another country.
[Todd:] North Korea denies hacking Sony but if Pyongyang pulled this without any outside help it would be the greatest success for their shadowy hacking group called Bureau 121.
[Unidentifed Male:] Frankly, North Korea probably doesn't need the help. They've been investing in their own cyber capabilities for the last four or five years very heavily and they've had a couple of trial runs with attacks on South Korean media and banks.
[Todd:] And one analyst points to a key reason why other governments may not have helped North Korea with the Sony hack. He said most governments wouldn't be foolish enough to hand any kind of attack tools to North Korea given their erratic behavior. Brian Todd, CNN, Washington.
[Savidge:] Not everyone loves the decision to bring Cuba and the United States closer. Some people have committed heinous crimes and when they go to the safe haven, they caught the first flight to Havana. So should Cuba turn them over to us? We'll talk about that, just ahead.