And people who have sat in this chair. Those who have blazed the trail before me. As my mother said, we all have something. And everyones story has purpose and meaning and value. And i share this morning, this day of celebration, with everyone. And we have a lot of surprises. Oh, no. For you. Were going to start with one from 1600 pennsylvania avenue. Wow. Good morning, america. And welcome back, robin. Robin, we just want you to know that the whole obama family, weve been thinking about you and praying for you and rooting for you every step of the way. Youve been an inspiration to all of us. And we couldnt be happier that youre back here, doing what you do best. And personally, im looking forward to our interview together in a couple of days. Robin, its great to see you back in that chair. And were all excited to start our morning with you once again. Im on top of the world that is so incredibly special. I do have little bangs right here. The hairs growing in a little more. Thats very special for them to do that. And i am looking forward to sitting down with mrs. Obama. Its going to be great. Grab your coffee, america. Settle in, because this feels right. For the first time, im speechless. I love you. Thats really saying something. Josh, we have the scary explosion in kansas city. We do have breaking news to get to. But today, it follows the best news of all. We love you. Welcome back. Were going to turn, now, to kansas city and that massive explosion you saw at the top of the show. It leveled part of a Shopping Complex in kansas city. Police, right now, are searching for any people who might still be trapped in the rubble. Abcs alex perez has been on the scene all night and joins us now with the very latest. Good morning, alex. Reporter good morning, josh. And welcome back, robin. Right here in kansas city, at least one person remains unaccounted for. Investigators are using cadaver dogs to help them comb through this debris. It was dinnertime when this explosion turned everything upsidedown. Witnesses say the massive fireball, which engulfed an entire city block, could be seen for miles. The explosion, rattling windows blocks away. Everything shook. And it was you could feel it, almost as much as you could hear it. It was, by far, the biggest explosion id ever felt in my life. Reporter overnight, 100 firefighters worked to knock back the thick, black smoke and shooting flames, which forced onlookers to flee this kansas city shopping district just around 6 00 p. M. And injured more than a dozen. This was a happy hour at a restaurant. There were patrons in the restaurant. Were also concerned that there may be additional people that were not able to get out of the structure. Reporter this morning, investigators are trying to figure out what caused the blaze. But believe a contractor may have hit an underground natural gas line. We were grabbing our stuff. And the explosion hit. And it hits you like a shockwave. Reporter witnesses say gas fumes could still be smelled hours after firefighters got the flames under control. Again, one person remains unaccounted for. 16 others had to be treated for their injuries. Authorities say, at this point, amazingly, theres no reports of any fatalities. Josh . Alex perez, in kansas city. Thank you for that. Police south of los angeles are trying to figure out what exactly prompted a man to go on a wild shooting spree during the morning commute there. The 20yearold killed a woman at his home and carjacked several people during his escape, shooting one man executionstyle, as nearby drivers watched in horror. When it was over, four people were dead, including the shooter, who took his own life. And on wall street, the dow begins the morning roughly 100 points from setting an alltime record. But this market joyride may be shortlived. There are new concerns about gas prices dragging down the overall economy. Prices are now rising at the fastest rate since 2005. And in washington, some 85 billion in Government Spending cuts are due to take effect on march 1st, threatening hundreds of thousands of jobs, unless lawmakers can find a way to compromise. And workers at apple, who long boasted their macs are immune to viruses, have fallen victim to the hackers that hit facebook and twitter. The attack is traced to eastern europe. Apple plans to release a Software Update for mac users. And finally, she is at it again. A dramatic, new eruption at italys mt. Etna, sending a fountain of fire. One might even call it magma. Shooting into the sky. Experts say she may be entering a new period of increased activity. We all want you to know how hard it was to book the tectonic plates for robins return. To gma. We got it done. When that crossed the wires yesterday, there was hosanna. Josh, thanks so much. Oscar pistorius, back inside a south African Court for the second day of his bail hearing. Stunning details being released by police this morning. And abcs bazi kanani with the latest from south africa. Good morning, bazi. Reporter good morning, robin. And a big welcome back to you. In court this morning, the key witness on the stand was the chief investigator in the case against Oscar Pistorius. He talked about what he found inside pistorius house, the night his girlfriend was shot. And explained the main reasons prosecutors insist this was murder. Prosecutors say there is no way the shooting death of Oscar Pistorius girlfriend, model reeva steenkamp, was an accident. They say forensics suggest that pistorius was in a standing position master bathroom when he shot the model. Who was behind a locked door in a smaller powder room. Prosecutors say they found two boxes of testosterone in the bedroom. But prosecutors maintain witnesses heard constant arguing. We have a witness who says she heard nonstop shouting and fighting between 2 00 and 3 00 a. M. Prosecutor gerrie nel. He said another witness saw lights on at the time of the gunshots. Both claims, directly contradicting what pistorius said happened on that valentines day. When he says, after a quiet night at home, in the pitchdark, he accidentally shot steenkamp through a bathroom door, mistaking her for an intruder. And then, desperately trying to save her when he realized his mistake. I tried to render the assistance to reeva that i could. But she died in my arms, said pistorius. Prosecutors say ballistic evidence also will show pistorius lied when he said he was not wearing his prosthetic legs when he fired his gun. But that, in fact, he had taken the time to put them on first. Prosecutor nel asked officer botha. You were there . What was the angle . Officer botha, seems to me down. Nel, through the top part of the door, not the bottom . Officer botha, definitely. As new details come out, reevas brother, adam steenkamp, spoke to Good Morning America from his familys home in port elizabeth. Were not focusing on whats happening with oscar at the moment. Reporter prosecutors are arguing pistorius should not get bail because of the amount of money he has in offshore bank accounts, they consider him a potential flight risk. George . Okay, bazi. Thanks. Lets get more from gma legal analyst, dan abrams. I was struck by a tweet from the bbc in the courtroom. After they presented its case, the pistorius family looked relieved. And they quoted a junior prosecution official saying, were in trouble. Im surprised by that, as well. Welcome back, robin. I was really surprised. Why . Because the prosecution has already presented a pretty strong case here, with all of the evidence laid out, about what happened there. But this has been an effective crossexamination. No question about it, of the Police Detective. Undermining some of the evidence. In particular, for example, an ear witness. Remember, really important point. Were they fighting before this happened . The prosecution says, yes. Well, on crossexamination, the Police Detective concedes that this ear witness was 600 meters away. Could not necessarily have heard exactly what she was saying or he was saying. On the other hand, you have this Police Official saying that pistorius must have put on those prosthetic legs because of the angle of the shooting. Yeah, ballistics is complicated. All were hearing so far in this bail hearing thats all were talking about right here. This is a bail hearing. This isnt the trial. This is to determine whether he gets released on bail. This officer saying, it seemed to him they were coming from the top of the door, versus the bottom of the door. Well, this is a science here. Theres going to be enormous amounts of testimony that will come in about ballistics that will be crucial. I dont think weve heard enough. And chances he gets bail, very low. The chances i dont know. I think that its unlikely hell be released. But i think he has a shot. Dan abrams, thanks very much. All right, george. Now, to an abc news exclusive and a live report from inside iran, as they get ready to head into negotiations over the Nuclear Program with the u. S. And other nations. Abcs david muir has just arrived and joins us now from tehran. Good morning, david. Reporter robin, just to hear your voice, a half a world away, enough to make us smile. The whole crew here, behind the camera, welcoming you back, even here in iran. And as you mentioned, robin, its a critical moment here. Were inside this country because u. S. Sanctions against this economy have crippled the economy here. And just days away, now, from iran returning to the negotiating table over its Nuclear Program. And as you point out, in a very rare move, theyve allowed us in to report from the streets of tehran. This is a tenuous time here, just days before iran returns to the Nuclear Negotiating Table with the u. S. And others, since talks collapsed eight months ago. This morning, as we drove through this city of 12 million, it is a city squeezed, not only by the traffic, but by the evertightening economic sanctions, led by the u. S. Some of the cars clogging these streets, tripling in price. Its groceries, medicine, if youre lucky enough to find it. And as headed into the subway, it is a proud republic, where the roles of men and women are still well defined. And the front car says womenonly right here. Many say the currency is in a freefall. Losing 80 of its value just in the last year. And theres fears among many here that the economy is heading towards collapse. But will the sanctions work . Irans supreme leader, ayatollah khamenei, speaking to americans just before these nuclear talks, telling the iranian people, we will not negotiate under pressure. The u. S. Is pointing a gun at iran and wants us to talk to them. The iranian nation will not be intimidated by these actions. Some very stern words there from the supreme leader. And, robin, on a bit of a personal note here, i wanted to be one of the hundreds that tweeted you to welcome you back here. But a rude awakening here in iran because twitter is blocked in this country. Facebook, blocked. All social networking. It gives you an idea of how controlled the message still is here in iran. So, my message comes from the heart, robin. Well save those tweets for later. Thank you very much. Were going to turn to washington now. And Vice President joe biden unplugged. As part of his leading role in the president s efforts to prevent gun violence, he was taking questions yesterday from readers of Parents Magazine. Abcs jon karl was listening in as both biden and the parents got more than they bargained for. Reporter heres a side of joe biden you dont see every day. Buy a shotgun. Buy a shotgun. Reporter he wasnt doing a commercial for his favorite gun shop. He was responding to online questions from Parents Magazine. He seemed to get a little rattled when some of the questions came from people unhappy with the president s gun proposal. Do you believe that banning certain weapons and highcapacity magazines will mean that lawabiding citizens will then become more of a target to criminals, as we will have no way to sufficiently protect ourselves. That came up again and again. Is this Parents Magazine . Ive never heard anybody in Parents Magazine ask these kinds of questions. Whats her name . Kate. Kate, if you want to protect yourself, get a doublebarrel shotgun. Have the shells, a. 12 gauge shotgun. Reporter the Vice President said thats exactly what he told his wife to do. I said, jill, if theres ever a problem, just walk out on the balcony here, or walk out. Put that doublebarrel shotgun and fire two blasts outside the house. I promise you, whoever is coming in is not going to you dont need an ar15. Its harder to aim. Its harder to use. And, in fact, you dont need 30 rounds to protect yourself. Reporter biden is the president s pointman on gun control. But hes also repeatedly tried to show that hes a believer in the second amendment. To another reader of Parents Magazine, he said, i have two shotguns at home. Nobody is going to come and take my guns. And, george, i have to say one more thing. From all of us here in washington, welcome back, robin. Awesome to have you back. Jon, thank you. Great to hear it. A very blunt joe biden. Lets move on now to the mustard Marketing Campaign that had everyone saying, do you have any grey poupon . Its back after 16 years, but with a twist. Nick watt has the story, on whether the push will cut the mustard. Pardon me, would you have any grey poupon . But, of course. Reporter that was then. Commercials that went viral before we even knew what that meant. And this is now. Diehardstyle redux of a campaign thats been off our screens for 16 years. It aired during the oscars sunday night. Grey poupon is throwing 1. 7 million at this ad. But theyre hoping its going to have a lot of legs and it will go viral. Reporter and save this ancient mustard, struggling in todays crowded luxury condiments market. They are looking to the idea that people with a british accent and eat in the back of a rollsroyce have impeccable taste in mustard. But, in 2013, do people still remember . Pardon me, do you have any grey poupon . Sure. Sure, the older crowd remembers. The youngsters . Pardon me, would you have any grey poupon . Okay. Youre way too young. Grey poupon. They were great commercials. Will the new commercial win her over . Well, of course. Reporter for Good Morning America, nick watt, abc news, los angeles. Oldie but a goodie. A real gift for you. A vintage nick watt. I missed nick. And i missed turning this way to say, sam with the weather. Good morning, robin roberts. Good morning, everybody. Were going to start with a rough day in california. How about two tornadoes reported from redding to sacramento. They get probably 11 tornadoes in california in the course of a year. But its a little unusual to have two reported. If they happen, they happen around this time. And you got a little hit of snow, as well. So, above 900 feet in sacramento you were getting snow. Snow levels in southern california, came to 2,000 feet. This is a big storm in the making. Watch where it goes now because this is critical for you to understand. Theres a level of ice here that goes through oklahoma, kansas, missouri and a little bit of arkansas, as well, today. Big snowmaker on top. Huge storms in the south. Well track this for you. So will your local abc stations. So, you know exactly what happens with this giant storm that moves into the country. Theres cold air here, 27 below at international falls. That northern line is ice and snow. Everythings exactly the way it should be here. All right. All that weather brought to you by Royal Caribbean cruises. Robin . I just noticed. Is this a bigger desk . Yes. A little bit. Not big enough for lara. I did notice that. Coming up, Kelly Clarksons heated war of words with music mogul clive davis. Why she says she refuses to be bullied. And feeling stronger every day. How robin got into fighting shape, ready to return just five months after her bone marrow transplant. Robin, heres a message from our alma mater, espn. Robin, everybodys welcoming you back, mostly to gma and to news. No, no, no. We know where your home is. We know where you started. Sports. Were happy to have you back. And we love you. Keep on smiling. And keep on doing what youve been doing, girl. Youre doing your thing. We love you, robin. Thank you very much for being such an inspiration to so many people. And even though we dont elect stuff at espn, i would elect you as first lady of espn. Congrats for coming back. Glad youre back. Glad youre back. Hd 4. Hd 4. [ anouncer ] ihop is in time square to compare new griddlemelts to your usual breakfast sandwich. A lot more flavor. 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