Thr feet. Thank you. Lord have mercy. Good morning, america. How did you know j. T. Was going to own that night. With Chris Stapleton who had a big night, as well. A lot more on that. Oh, boy, a lot of great performances. We have i acomplete wrapup coming up. We begin with major developments in the investigation of that passenger plane that fell from the sky in egypt. Preliminary information suggesting a bomb may have caused a jet toolow apart in midair. We are just hearing from defense secretary ash carter aboard an Aircraft Carrier in the south china sea. Our National Security team covering all the angles for you and brian ross is going to start us off. Good morning, brian. This morning there is growing concern a terror bomb did bring down that russian plane. If so it could represent what u. S. Officials call the nightmare scenario for air travel everywhere. Counterterrorism Officials Say new intelligence ledhem to their conclusion that the plane was likely blown out of the sky. We have concluded that there is a significant posbility that that crash was causedy an explosive device on board the aircraftft. Reporter as officials continue to search for clues in the desert the u. S. Secretary of defense this morning echoed the concern about a bomb. In an exclusive interview with abcs bob woodruff conducted on board an Aircraft Carrier in the south china sea. That is one possibility, an explosive device and that is consistent with what we know but i understand that there are other hypotheses. Reporter the russi flight left from the Sharm El Sheikh airport in egypt where now all flight to and from britain are suspended because of what british officials told abc news was lax security. There are indications now that the airport itself may have been compromised by the islamic state. Reporter within hours, the the sinai said it was responsible for the russian jet crash. A claim that was at first dismissed as propaganda but now the group has become a prime suspect and it has posted a second claim of responsibility. Citing russias new role in fighting isis in syria. Now that russia has begun operating in the region they become a target of the same terrorist groups tha have been targeting the u. S. And european nations over the last several years. Reporter while there is till no hard evidence a bomb was responsible, u. S. Authorities are already considering what steps the could and should take to increase security for u. S. Flighthts that go in and out of the region, george. Okay, brian, thanks very much. More from martha raddatz, and, martha, if this is isis, if it was a bombb it would be a major shift i in the strategy. Reporter it would, george. If isis got a bomb on this plane, it is a game changer for the fight against them. There have been some intelligence officials who viewed isis as a regional problem, a group that wanted territory in iraq and syria, but were not thinking b beyond that. W the Intelligence Community has g to be saying if they could bring down a russisian airliner, what else could they do . And remember that russia just started bombing in syria over a month ago so if isis brought the airliner down as retaliation to the russians, isis got that plan together very quickly. And i would think russia would have to go after them even harder. Yeah, russia will have to change their straty and if, indeed, isis is branching out, what does the United States do reporter well, theyre going to be laser focused on the safety of our ire lines overseas. I travel a lot and surity varies. They will b focused at airlines at homes, as well. Weve heard concerns about lone wolves. There would be even more concern about that now, george. Okay, martha raddatz, thanks very much. We bring in abc news aviation consultant, colonel Steve Ganyard to talk more about what you were talking to martha about. If this was indeed sophisticated bomb what does that mean for u. S. Security here . Good morning, robin. I think, i think the important point is its not so much the sophistication of the bomb but its where the bomb is placed on the airplane and how big the bomb is. If we remember back to the pan am 103 flight over ckerbie, scotland, that bomb was less than one pound and able to bring down a 747 which is. Bigger than this aircraft. How will this change the way bags are checked . Well, you know, our own alex marquardtt was t telling us yesterday about how bad the security was, even after this incident in sharm and how bad it is in general in egypt so i think theres probably a proem throughout the middle east in terms of security but whenever anything like this happens, our own security folks are going to go back and look and see if there was some hole the terrorists might have been able to get a bomb through. Might have been able to get an unchecked bag on that airplane but when we go through our own tsa prechecks we times get irritated at having to sit and wait in line but theyre there first line of defense against Something Like this happening in the United States. We have to keep that in mind, thank you. Race for president and donald trump set for center stage on saturday night live now facing new protests, latino groups picketing the show as Bernie Sanders takes tough new shots at democratic frontrunner Hillary Clinton. Abcs jon karl is on the campaign trail in manchester, New Hampshire, with the latest. Good morning, jon. Reporter good morning, george. Donald trump is now finally spending some of his billions on campaign ads releasining his first radio spots this morning set to air in iowa, New Hampshire and south carolina, but he will likely get far more attention when he takes the stage on saturday night live. Live from new york, its donald trump. Saturday night live has released its first promos for trumps appearance this weekend as the shows guest host. And because of equal time rules for television, mr. Trump can only speak for four seconds in this promo. So let me just say this, ben donald has promised for the whole show he is not going to brag or say hes the besest at anything, right, donald . Thats right, cecily and im going to do the best job anyones ever done not saying it. Reporter trump, of course, is predicting the show will be huge. A lot of them are going to say itll be one of the highest rated d shows inheir history. All donald trump has got to go. Reporter overnight hispanic groups delivered a petition claiming over 500,000 signatures calling on snl to dump trump over his controversial remarkses on immigration. Another person who wont be watching is rival dr. Ben carson. Because i think the presidency is a vy serious thingg and i dont like making light of it. Reporter trump prepares for his hosting duties hes also taking to the airwaves releasing this morning. If the people of iowa vote for me, youll never be disappointed. I dont disappoint people. Together were going to make America Great again. All trump, trump, trump. To me it feels like a historic day. Reporter he bece the first republican candidate to file for the ballot in New Hampshire. This may b a very, very important signaturee or may not so important. Well have to see what happens. Reporter and nearly everywhere you go here in New Hampshire youre bound to run in a president ial candidate. George, by my count t there are seven wouldbe president s campaigning here in New Hampshire just this morning. You have been on the bus with jeb bush dropping in the polls right now and taking a page from john mccains playbook going across the straight. Hes got his new bo, hes going around around the state and we see a clearly energrgized jeb bush, the most energy ive this campmpaign. I asked hip, though, about a Media Consultant he has hired to debate this is what he said. But youve hir this media debates. Yeah, ive had one meeting with the guy. Im going to be better. What i is he telling you. Hes telling me to be me. Hes telling me to own what i believe. You need a consultant too tel you that. Yeah, its amazing, isnt it . Probably not. Probably not. That debate is coming up on tuesy. Meanwhile, on the democratic side Bernie Sanders really shifting grs now and going right at Hillary Clinton thats rightht in an interview with wall street journal he talks about her changing positions on key issues like trade and Keystone Pipeline saying they raise character questions and then he said thiss about her emails, those damned emails he talked about. He said they raise valid questions, her privateuse of private emails. I did not say end the vestigation. Thats silly. Let the investigation proceed un unimpeded so Bernie Sanders taking a. Sharper totone here against Hillary Clinton now. Even on the email issue. Opening that back up. Okay, jon karl, thanks very much. All right, george, we move on to a violent rampage at a university of california campus. A male student stabbing four people before being shot dead by police. All of the victims are expected to survive and invnvestigato are trying to figure out t the motive. Abcs matt gutman is in merced, california, with the latest. Good morning, matt. Reporter hey, gd morning, robin. The key to untangling why this student may have gone slashing his other clalassmatesay have been in the backpack that he wore. Now, there is a brief chase right over that bridge, you can see the lights right there. The police shot that young man dead. Now, they detonated his backpack and testing a substance found interside of it. The shooting spree began in the building beyond it. As this attacker was in this class, a contractor nearby overheard the commotion. Thought that he was running into break up a fight. Instead he encountered the attacker right there. Somehow managed to lure him out. Now, that contractor buy on price is being hailed as a hero saving lives and caught up with his father overnight. Did byron get a good look at him. Said its a real weird thing that im probably the last guy that stared him right in the eyes. Reporter moments earlier john prices son was working here at the class and office buildingng when h heard screams. It was mayhem in there. Apparently a lot of things were going scaming and as soon as the attacker saw him he went after him. Reporter drawing the attacker out of the classroom. He was able to kick the guy in the head and got him away. Rather than run away from it, you know, not knowing what he was up against he went into it. All of us want to be able to think that were that guy who can dohat when called on. Reporter and byrons father says hes goingo be just fine. Probably will be back at work the next couple of days but this community is still reeling and thats possibly because stabbing attacks are so unusual. The fbii is iestigating whether this student who was called antisocial by his roommates was just having a bad day, whether this was a lone wolf attack or possibly an act of domestic terrorism. George. Okay, matt gutman, thanks very much. We turn now to that stunning twist in the case of the Illinois Police officer killed back in september. Authorities now say lieutenant Joe Gliniewicz shothimself in a staged suicide. Abcs alex perez is in fox lake, illinois, with the latest. Good morning, alex. Reporter good morning, george. Instigators say lieutenant gliniewicz felt the walls were closing in on him and even pland evidence to try to mislead them. From standup officer to lying thief, this morning new details about the death of lieutenant Charles Joseph gliniewicz not kied in the line of duty as initially believed but instead took his own life. Gliniewiczs death was a carefully staged suicide. Reporter investigators sayay for seven years gliniewicz stole and laundered money from the Fox Lake Police departments youth prograram, a program that he ran and feared he would soon be exposed. Using the money to pay for personal trips, his mortgage, gym memberships and even adult websites. Gliniewicz committed the ultimate betrayal, to the citizens he served and the entire Law Enforcement community. Repte this a dramatic conclusion to a twomonth mystery, gliniewicz radiog for help september 1st telling officers he was pursuing three suspicious men. 104. Did you need a second unit. Go ahead and tart somebody. Reporter by the time backup arrived gliniewicz was found dead. Send everybody you possibly can. Officer is down. Reporter 150 investigators spending 25,000 houours following up on hundreds of leads. But the alleged suspects never found. The investigation now revealing gliniewicz used his experience working mock crime scenes to plant evidence and then shot himself twice with his own gun. And Authorities Say they are investigating two other people who may have known about the emzzlement, the gliniewicz family in a s statement saying they would not comment on the investigation and theyre still coping with their loss. Robin. Thanks, alex. Storm dumping feet of snow from california to colorado. Its now moving into texas with gusty winds and the potential for more flash flooding, ginger. That same storm blowing through denver overnight. Being being in the 60s and wake up the next day and you have your first snow of the season. Thats what happened in denver, the thunder snow, that has an associated cold front and its going to bring severe storms from dallas to wake so to austin, strong winds later this afternoon and evenin large hail, even an isolated tornado. That is the same spot that was with the flash flooding last weekend. Arkansas. And, again, that heat, ive got to get to it. Are chester, new york, hit 7 yesterday. Woo. Ill tell you when it cools down yeerday. No rush in cooling down there, ginger, thank you. Now amy with the mornings other top stories starting with some surprise inging headlines from formatter president bush. This is being called a in his new buyingiographer the elder bu has scathing criticisms and says his son was not supported well by his aides and singles out dick cheney saying he became too hard line and hawkish and lls former defense secretary Donald Rumsfel arrogant. The book published next week. Iran appears to be stepping up psycher attacks. Those attacks have reportedly targeted email accounts of Obama Administration officials. The wall strereet journ says the attacks have been on the rise since an american Oil Executive was arrested in iran last month. Well, back here in this country a close call for a woman driving down a massachusetts highway when this wood post came crashing through h her windshield. Amazingly she is okay. Police think the post was thrown into the air when a truck ran over it. And there was a big surprise for people eating in this florida restaurantnt. Ceiling tiles started fling down on to them and seconds later a man came crashing down through that ceiling. Police say he was a wouldbe thief trying to break into the restaurants office. And finally, annexpected layover for some Airline Pilots in asia. They had to land in indonesia went off. But, see, there was no fire. It turns out it was methane gas. Apparently from all the gassy goatss in the cargo hold. They took off a short time later. Them. I dont know what they fed those goats but diversion. No one wants to comment. People are eating breakfast. I think we got that. We got the gist of it, thank you, amy. Youre welcome. Spencer stone speaks out for the First Time Since he wa thats in just 0 seconds. 30 seconds. Were back at 17 with Spencer Stone, the hero who helped top that terror attack on a french train is now speaking out for the First Time Since he was stabbed outside a nightclub in his hometown. A suspect has been arrested and abcs david wright has the story. I nover thought i would ever get stabbed in nye life. The fact that it happened twice within a twomonth period is insane. Reporter Staff SergeantSpencer Stone speaking for the First Time Since this viole altercation caught on security cameras last month outside a sacramento nightclub. They didnt know who i was. They were just out there maybe looking for trouble, looking to get in a fight. Reporter just this week sacramento pice arrested 28yearold james tran in connection with the stabbing. Partly through the security footage which showed the suspects getaway vehicle. Authorities say they stopped trans car tuesday near his home. Then arrested him for the charge of attempted mururder on mr. Stone. Reporter the air force had just promoted stone and the french gave him the legion of honor for his part in stopping a gunman armed with an ak47 on board a paris bound train in august. The gunman slashed stone with a box cutter. But he and his friends still managed to hog tie the man and give first aid to a fellow passenger. Im just glad that, you know, ive had enough training to be helpful in those situations. Reporter stone and his two friends got a heros well when they came back to sacramento. Now the airman is recovering from wounds in the second stabbing. With wounds in his lungs, liver and heart. I hope this doesnt define me for the rest of my life. I hope i can use everything thats being offereded to me to, you know, do good in other peoples lives. Reporter even after two close calls in two months, Staff Sergeant stone counts himself lucky. For Good Morning America, david wright, abc news, new york. His a lucky young man. Rena williams leaping into action after a thief tried to steal her phone. The exclusive video youll only see right here on gma. H can sometimes pets make mistakes. But the Stainmaster Pet