[Lu Stout:] You're watching News Stream and these are your world headlines. Now the prime minister of Bangladesh has visited the site of a building that collapsed near Dhaka last week to see the devastation firsthand. Heavy machinery is moving into place to shift the debris. Nearly 400 people were killed when the building came down five days ago. Many more are still missing. Now the owner of the building and five others have been arrested. Fire department officials say at least 55 people have been injured in an explosion in the Czech capital of Prague. State TV is reporting that it was a gas explosion. Authorities say the first floor of one building was destroyed in the explosion and windows were blown out in nearby buildings. The surviving suspect of the Boston Marathon bombings is being held in a small cell at a prison medical facility some 60 kilometers outside Boston. A spokesman says Dzhokhar Tsarnaev is speaking and interacting with medical staff. The 19-year-old was charged with using a weapon of mass destruction in the April 15 attack, which killed three people and injured more than 260 others. Meanwhile, there is new information coming out of Russia in connection to the Boston bombings. Our Nick Paton Walsh has also spoken again to the parents of the suspected Boston bombers and has new details from our bureau in Moscow. So Nick, first tell us what you've learned from the parents. What did they tell you?
[Nick Paton Walsh, Cnn International Correspondent:] Well, I spoke to both parents in the last couple of hours. And it was quite clear from speaking to the father very brief, very strained conversation. He said simply I'm sick. I am sick. The mother, more details. She of course confirmed his bad condition, his connection I believe with high blood pressure. But he does appear to be shaking as well. There are obviously major concerns for his health. Travel plans keep changing. She made it clear he's not in any condition to travel great distance, particularly to the United States at this particular point. She also said that she, herself, would be willing to go to the United States only if it was made clear to her she could see Dzhokhar. And she said she wasn't really bothered about the potential outstanding charges for shoplifting, suggestions about that, but also given how this investigation is widening and potentially accusations are being lobbed in her direction, she said she would still go regardless of these potential risks. But clearly a parent under great strain here. Both sounding absolutely exhausted. Their travel plans constantly changing. That U.S. trip most certainly delayed Kristie.
[Lu Stout:] And separately, Nick, and we don't know if this is related, Russian special forces have killed a member of a militant group in Dagestan. What can you tell us.
[Walsh:] This is a man called [inaudible]. Now he is a member of a militant group headed by a man called Abu Dujan. And the pictures you'll see now of a very violent special forces raid in the early hours of yesterday morning. Police have confirmed [inaudible] was killed in this particular attack. How does it relate to the Boston bombings? Well, Abu Dujan was killed in December, also by Russian special forces in a similarly violent encounter. He was a man to whom Tamerlan Tsarnaev linked to a video of from his YouTube channel. So there's the link between Tamerlan Tsarnaev and Abu Dujan. We don't know if they met or if he was just simply interested in his preachings online, his statements online. But we do know [inaudible] has been killed in the last 24 hours, 48 hours, in Dagestan by Russian special forces. So it's absolutely clear that Russian special forces and security services are on the trail of the Abu Dujan group as we speak, we just don't know if that is related to any information they're passing to the FBI at the moment Kristie.
[Lu Stout:] And you've also been following this growing debate about what Russian authorities knew about the Tsarnaev family years ago and didn't tell the
[U.s. Walsh:] Well, it is clear from I think everyone's perspective the Russians did repeatedly warn the U.S. about Tsarnaevs. Now, what is not clear is how much information they gave back when the FBI requested more detail. That's when the exchange appears to have slowed. There has been information passed across in the past few days relating to a wiretap which appears to implicate the mother, according to U.S. officials, talking about jihad, discussing jihad with one of her sons. We don't quite know whether that's incriminating or simply a discussion of completely different form. The point here, really, is the debate diplomatically will continue to be who knew what when. We're not heard an open transparent public version of events from the Russians. That could be because they're still hunting down people in Abu Dujan's militant group. It could be because they think these exchanges are best done privately. Certainly, the American side of things leaks an awful lot more. But you're going to see, of course, a lot of pressure from congress on Capitol HIll, to work out who said what, when. A lot of pressure on the Russians and of course an easy get out for the FBI for standing accused of dropping the ball to claim that enough information from the Russians. But certainly those years ago there were repeated warnings, it's just not clear if the information kept flowing once the FBI decided there wasn't much to investigate Kristie.
[Lu Stout:] Now many, many different threads to this story. Our Nick Paton Walsh across it all, thank you very much indeed, Nick. Now investigators are also scouring Dzhokhar Tsarnaev's online footprint. They're looking at his accounts on Twitter and the VK Russian social networking site. But there is one online profile that's proved a little bit harder to find. CNN Money's Laurie Segall has more.
[Laurie Segall, Cnn Tech Correspondent:] A deleted Instagram account sources say belonged to Dzhokhar Tsarnaev. Unlike the rest of his digital life, it hasn't gotten much attention since his arrest. Close friends say Dzhokhar used the name J Miester, but it was removed before the April 15th bombing. But a digital trail shows images that he liked in the past. Several include references to Chechnya that are marked with dozens of hashtags. One shows a Chechnan warlord who masterminded terrorist attacks against Russia and but was killed in 2006. Several show Dzhokhar interacting with other users. An expert on Chechnya says is shows an understanding of Chechnya and its struggle for independence from Russia. The close friends tell CNNMoney from what they saw he used Instagram for social purposes. So how are we able to resurrect them? Here is how it works
[Sam Altman, Programmer/tech Entrepreneuer:] So, we're looking at a photo from Instagram on a site called Statagram, and this is the copy as it existed on the web today. We can see that these users, these 19 users have liked it, and we can see there are six comments on the photo. Here are the hashtags. However, we can also go back in time, thanks to the Google web cache. Here is other data around that back from April 10th of the same photo. So, we can see there is the same six comments there are today. And here is a list of users that like the photo, most of which are already on there and there have been new ones since April 10 that have liked it as well. But there is one that liked it in the April 10th version of the page, jmeister1 that is not you can see on the current version.
[Segall:] Law enforcement experts like Julitette Kayyem say the deleted account is likely to get a close look from investigators.
[Juliette Kayyem, Cnn National Security Analyst:] If I were an investigator right now, obviously the platform he deleted matters the most. Were there clues embedded in the combination of images that can tell us something about what Dzhokhar was thinking? Because some of those pictures are very benign, some of them standing alone don't mean anything.
[Segall:] Digital footprints continue to get bigger as people become more and more willing to put their lives online. Laurie Segall, CNN Money, New York.
[Lu Stout:] You can find out more about that story online. Just click on to our website CNN.cominternational. There's also of course more about the investigation and the prison medical facility where Dzhokhar Tsarnaev is being held. Now time now for your global weather check. There is heavy rain in the Middle East, in particular Saudi Arabia and the Gulf region. For more, let's go straight to our Mari Ramos Mari.
[Mari Ramos, Cnn Weather Correspondent:] Hey Kristie, yeah, this is something that's been going on for several days already. And it's unusual in its scope as two different things. First of all, its been very heavy rainfall. And the second thing is that it's somewhat out of season, you could say, because even though the rainiest months of the year January, February, March, in that order it does tend to rain in April, just not as much as what they've had recently. And I want to show you a couple of pictures from the region. Oman has been one of the hardest hit areas, particularly in the north. It began raining in Oman I think on Wednesday, so we're already four or five days into this. And it has taken quite a toll on the region. There are many areas that are completely blocked off because of the high water. Authorities asking people to not travel if they don't have to. There are many roadways, like I said, that have been blocked off, covered in water. Most of the deaths that have occurred, at least 10 across the entire region, have been people drowning in their vehicles or car accidents, because a lot of people of course not accustomed to driving on the wet roadways here. The other things is, some areas have been left without power. And any amount of rain that falls could really cause some additional flooding. So we're very concerned about this. I want to show you this satellite image right now. And you can see it again the rain and thunderstorms popping up in areas right over here across Saudi Arabia, in the interior portion. And this is going to be one of the areas to watch. But even as we head back over here, notice again the thunderstorms popping up across Oman, back over toward the UAE, and even Abu Dhabi has had some rains over the last 24 hours, not as much as before, but like I said it does continue to rain across this area. Then the rain kind of switches and it continues to move on into southern parts of Iran and maybe even into Pakistan, but the bulk of it again will be in this region right in here, so that's still going to be a concern. The temperatures have been a little bit cooler, of course, because of the cloud cover, below the average in many cases in Muscat, because of all the rain that you've had. For example, you had 27 degrees for your daytime high. Your average is 35. So you can really see what the rain is doing here. As far as the forecast, well this is what we have. The rain, this old frontal boundary will kind of remain along this area here bringing us the possibility of more wet weather. So this is still going to be a concern across the region. So, from here, I want to take you to Europe. A little bit of different story, so we're going to go ahead and switch gears, because I just like sharing these pictures, Kristie. Let's go ahead and take a look. This is from Sicily. This is in near Catania. We are talking about Mount Etna erupting yet again. It is the most active volcano in Europe. The 3,300 meter stratovolcano, which basically refers to the type of volcano that it is, has erupted yet again. These pictures are from the weekend. There's not danger to the population that is nearby. There were a few travel delays at the airport there. But it has reopened. And what's amazing, Kristie, the type of eruptions that Mount Etna have are actually considered small eruptions on the volcano scale. I can't imagine a big one. Back to you.
[Lu Stout:] You know, those pictures truly awesome in the pure, nontrendy sense of the word. Just awesome. Mari Ramos, thank you so much for the share and take care. Now let's look back at our video rundown. Earlier, we brought you the latest on the South Korean workers at the Kaesong Industrial Complex. And in a CNN exclusive, we saw my colleague Anna Coren bravely training to fly South Korea's new supersonic jet. But now to tech news. And Apple's iTunes music store has just turned 10. The digital media store, it launched on April 28, 2003. And now it sells TV shows, movies, apps and books, but back then it only sold music. And its arrival marked a sea change for the recording industry. Since the introduction of iTunes, music sales have plummeted in the United States. It went from nearly $12 billion in 2003 to just over $7 billion last year. And that's because iTunes made it possible for people to download their favorite singles for a cheap price instead of buying more expensive CDs. Now iTunes became the largest music retailer on the planet by 2010. And according to NPT estimates, iTunes is currently responsible for 63 percent of all digital music sales. That puts it well ahead of newer competitors like Amazon and Google. But another threat has emerged in the form of internet radio. So what does the next decade hold for iTunes? Nilay Patel is the managing editor of the tech blog The Verge. And he joins us now live from CNN New York. And Nilay, 10 years on, we went to the stats just then, iTunes is still the leader of the digital music pack, but are the cracks starting to show?
[Nilay Patel, Managing Editor, The Verge:] You know, I think they are. I think a lot of the power that iTunes had at the beginning was the really tight lock-in it had with devices like the iPod and, you know, the early versions of the iPhone. But if you look at how people are starting to buy and consume music now, there is a bigger shift ongoing to subscription services like Spodify, Rdio, and Apple itself is being, you know, rumored to be working on deals to launch its own streaming service in the future. And so iTunes as a program that you run on a desktop computer that you plug a phone in over a wire and sync music over USB, that model is starting to kind of fade away. And iTunes itself needs to change to be more of an internet centric service. And they're already starting to do that, you know, with iTunes in the cloud which takes all the music from your computer and puts it in the cloud and sends it down to you. But they need to move the entire hub of iTunes up to the cloud and start streaming music to you to compete with upstarts like Spodify and Rdio.
[Lu Stout:] Yeah, you mentioned Spodify, Rdio, these subscription upstarts that are rivals to the iTunes Music Store, but of these top subscription streaming services out there, no one has really reported big profits yet. So is that the winning strategy at the end of the day?
[Patel:] You know, there is a big debate whether people want to own their music, or whether they just want to buy access to music. And when iTunes launched 10 years ago, Steve Jobs said on stage and said very confidently people just want to own their music, which I think is a model that's rooted in having physical media in your life you know, CDs, LPs, whatever. But I think that's starting to change. I think if you look at, you know, habits, especially among the young, most kids are getting their music off of YouTube, right. They're going to Vivo, they're going to just Googling it and hitting play on the first service they can see. So the idea that they want to own something physical is starting to go away. And music more than any other kind of media is very retail based. It's very consumer driven. So when consumer habits change, the services have to change. That's very much unlike something like TV or movies, right, a movie production company sells a movie to a studio which sells a movie to HBO and a theater and a TV station. And so consumer habits, you know, when you buy cable, they don't affect all the way back to how movies are made and sold, but when you change your consumption habits as a music consumer it changes the market immediately.
[Lu Stout:] Now there is suddenly Apple music buzz out there that Apple will launch iTunes Match, this $25 a year cloud music locker. There's also the rumor that Apple is going to launch a new music streaming service nicknamed if it happens iRadio. Your thoughs on those announcements. And if they do happen, will it be enough to draw the new fans, especially the younger demographic?
[Patel:] You know, well so iTunes Match is already launched in the United States. You know, they're rolling it out around the world. And they gained a lot of credibility in the music business for doing it in quote, unquote, the right way. So Google and Amazon launched similar services without appropriate licensing deals in place. And the nature of the copyright law in the United States is that you don't need the deals you can just do it. But that doesn't mean you're not going to irritate the music companies. Apple waited until they had the deals, then they launched the service, and they gained a lot of goodwill. The next step is for them to say we're going to launch a radio service, a streaming service that can go against Pandora, Spodify, Rdio, but they're big holdup right now is they're asking for licensing rights that are much lower than what those companies are paying. And they're saying, look, we're Apple. We have the iPhone, we have iTunes, and our volume will sell so much more music that we'll pay a lower rate, but you'll make more money. That's a pretty classic negotiating tactic. A Steve Jobs maybe would have pulled it off. He had the sort of charisma and gravitas to walk into the music companies and say this is what I want and get it. Apple's real challenge is doing that without that sort of personality at the helm.
[Lu Stout:] All right. Nilay Patel of The Verge, thank you so much for giving your thoughts on the iTunes music store 10 years on and what it could look like 10 years from now. Thank you and take care. You're watching News Stream. Still to come on the program, we take a look at the world's most advanced bionic arm. So advanced it is powered by thought alone. That's just ahead in our new art of movement series.