Search for at least two gun men. Good morning. Reporter good morning. Police have left the scene but tell me they will be back out to the shooting scene behind me here soon. Allegheny county police say they are looking for two gun men they believe carried out the attack about 1 001 00 last night. The gun men open fire in an ambush style attack during a barbecue. Bullets riddling a backyard filled with party goers. Weve got multiple people shot here. I have six people down. Total of five people deceased, three other people with gunshot wounds, two in critical and one in stable. Police say the bodies of four of the victims, three women and porch of a house. Investigators say shots may have been fired into the rear of a home and two different weapons could have been discharged from two different suspects. Residents say they were walking in the area when they heard gunshots and saw people walking away. Probably shocking everyone else up here. Im shaking because its pretty bad. Right now police do not have a motive for the shooting. As for the three surviving victims two men are in Critical Condition and one woman in stable condition at the hospital. Thank you so much. Let us turn to the president ial race. Hillary clinton and Bernie Sanders clashed on the debate stage last night ahead of next tuesdays crucial winner take all primaries in florida and ohio. The republican candidates have their own debate tonight. Both races covered beginning welker. Reporter secretary clinton and senator sanders will send the day barn storming. Ohio and illinois looking a lot more competitive. The biggest prize is right here, florida. With the democrats locked in an increasingly fierce fight secretary clinton faced one of the sharpest exchanges yet. If you are indicted will you its not going to happen. Im not answering that question. Reporter clinton took aim at senator sanders for opposing the auto bailout. If everyone had voted as he voted we would not have rescued it was the wall street bailout. Clinton used the strategy heading into the michigan primary but still lost in a she is hoping the attack will help win chicago. The candidates sparred over immigration. You are telling us if you become president you wont deport children . I would not. I dont think the secretary fully answered the question. I think the proof may be in the pudding. Reporter while both candidates took sharp aim at donald trump they deflected a question about whether he is a racist. I think it is unamerican. I think what he has promoted is not at all in keeping with american values. I think that the American People are never going to elect a president who insults mexicans, who insults muslims. Reporter and clinton with a rare moment of candor when asked why so many voters say they im not a natural politician. I have a view that i just have to do the best i can. Reporter senator sanders still has a very steep climb in order to win the nomination he would have to win more than 65 of the delegates moving forward but he has a lot of momentum and a lot of money in his war chest. That momentum could be key going into next tuesday in ohio and florida. Reporter the stakes couldnt be higher next tuesday. If secretary clinton has a strong showing and wins florida and ill it solidifies her as a front runner and puts the race out of reach mathematically. That is something she and her team are eager to do. If senator sanders were to win in ohio or missouri this would make him a real contender and he states outpacing secretary clint in ad spending and would add to momentum. That is when you see the race stretching through the spring and possibly the convention. Lets talk about the republicans meeting for the 12th debate of the campaign and there are signs we might not see tough personal jabs that dominated last week in detroit. Peter alexander is covering the race for us. Reporter beautiful back drop here at the university of miami. Marco rubio is candidly acknowledging that his personal mudslinging may have back fired. He is going to have to change strategies quickly if he wants to win next tuesday. Youre going to love your president. Reporter donald trump looking to notch another win in North Carolina. He has the great wall of thats done with love. Reporter raising eyebrows when asked whether islam is at war with the west. I think islam hates us. There is something there that is a tremendous hatred. Reporter stepping in the ring with rivals the billionaire boasting he will bring home the championship belt with wins in florida and ohio next week. The ultimate way of doing it. If you knock him out nothing can happen. Reporter will marco rubio pull his punches . Facing do or die in his home state the florida senator expressing regret about trading insults with trump. You know what they say about men with small hands. Reporter speaking with chuck todd. Not something im entirely proud of. My kids were embarrassed by it. Reporter compare that to comments last week. Are you sorry you went there . Donald trump spends a year on a regular basis. I said something one time. Reporter his crowd count wednesday in the hundreds in a Florida Stadium that seats thousands. Our campaign has beaten donald trump not once, twice, three times but eight separate times. Reporter touting new support from a familiar face, carly fiorina. Other people in our party are horrified by donald trump. Reporter john kasichs positive push may finally pay off. I refuse to get down in the mud to be elected president of the united states. I refuse to. Reporter with new poll numbers showing kasich leading trump. Im going to win ohio. Reporter predicting victory. Will the former Florida Governor jeb bush endorse any candidates. He met with marco rubio yesterday and will be with ted cruz and john kasich today. Sources tell nbc news he hasnt made a decision whether or not he will endorse. What happens tonight at the debate could effect that choice. Who could forget last weeks debate . It got so personal and so nasty. Do you know about how the candidates adjusted their strategies or should we expect more of the same . Reporter marco rubio telegraphing the need to focus more on policy and demonstrate that donald trump is more of an empty vessel suggesting he is a better choice. Ted cruz and john kasich doing the same. This is a last opportunity for all candidates trying to stop donald trump ahead of super tuesday. 367 delegates there. Rubio said he will win his own state. They may cater their mess mgs to those audiences. Donald trump has won 44 of the delegates. If he winz wins florida and loses ohio he will need 59 of remaining delegates to clinch nomination. Even for trump the stakes are high. Florida, florida, florida, ohio, ohio, ohio. Lets take a look at deadly storms across the south. Record rain, historic flooding with tens of millions still facing tough weather today. Janet shamlian is in hardhit louisiana just east of shreveport. Reporter good morning. This is not over in louisiana. Some homes behind me have as much as five feet of standing water in them. We are getting another storm here expected five inches of rain additional today and also this time the threat of tornadoes. Fear this morning what is coming next. This morning Severe Weather is putting millions at risk. Power. Record breaking rainfall and deadly flooding ravaging much of the south. Waters devastating parts of east texas and louisiana. Overnights flash floods in west monroe forcing road closures as rain water inundated this shopping center. In shreveport some residents cant get back to their homes. Many residences submerged to the roof. The water level so high this bridge barely clears the flooding. There is nowhere for the water to go. The ditches are full and continues to rain. Reporter cars stranded and simply abandoned in the road. It feels like a current from a river. I have no idea how to deal with a flooded house. Rescue of elderly and so did the national guard. Residents forced to evacuate themselves and their pets. Others gathering what is left from ruined homes. Everything you see is gone. I have a brand new roof on a house that is absolutely worthless. Me and my kids lost everything today. We need dry clothes. Reporter there are temporary shelters for some of those displaced. We want to keep everybody work together. We will get through it. Reporter those residents are anxious to see when they can return and what will be left when they do. There is not a lot left. He has three little girls, carried out the only items in their bedrooms that were dry and that was a handful of clothing. Heartbreaking. Janet shamlian, thank you very much. What is going to happen with all unfortunately, we dont have relief for at least the next 72 hours. We have an upper level low over mexico blocking high pressure. You can see this rain train coming in pushing in more rain from eastern texas into louisiana and now into mississippi. They have dropped some warnings back through central texas. 15 Million People under Flooding Risk because it is only going to take another half an inch to inch of rain to cause more flooding. The storms move over the same cities already with saturated ground. The heaviest rain starts to shift east by tomorrow moving into alabama, panhandle of florida. Look at the rainfall totals. We are expecting upwards of about seven to ten inches of rain throughout much of louisiana. That moves on into parts of mississippi and alabama and will continue to see that rain for at least 72 hours and then it finally does dry out. Right now not good. I havent seen a map like this is more like a hurricane, the moisture from a tropical system, these kinds of rainfall rates. There are new developments on the failed drug test by Maria Sharapova that she claims was an honest mistake. Now a suggestion that she may have been warned multiple times that the drug in question was going to be banned. Good morning. In two days the worlds highest earning sports woman will begin a temporary ban from tennis. Maria shaurrapova saying i wish i didnt have to go through this. The big question, is this the end of her career . Shes on her knees under fire from the tennis world, dropped by some plagmajor sponsors. Because you follow the rules . Sharapova broke rules and admitted it. I made a huge mistake. Reporter taking positive for meladonium. Others say it is a bad day for tennis. The rules are like this. Its fair. Now she must pay for it. Reporter her former coach blames her team. That is where her team let her down. Her physical trainer, doctor, agent, coach, somebody should have looked at the list. Reporter antidoping officials saying she was warned about the drug five times in a month. She was reckless says one. Im sorry. If you are running a 30 million a year you make certain you you ineligible. Reporter 23 million had come from endorsements. Her main sponsor, nike, has suspended her eight year 70 million deal. Other sponsors are decided whether to cut ties. In an open letter to her fans sharapova says im determined to play tennis again and i hope i have the chance to do so. I wish i didnt have to go through this but i do and i will. The stakes are huge. Its not just the money. She faces a possible ban of four years. I dont want to end my career this year. Reporter a lengthy ban would do just that for the Richest Woman in tennis. There are questions, too, for that world antidoping body. Why did it allow a heart drug that was a known stimulant not allowed in the u. S. To be legal for decades . Sharapova took it along with dozens of them have not tested positive. How many more drugs are out there legal, not made for athletes but giving some a winning edge . That question to go around this morning. We have an update on the flint, michigan water crisis. The city says it will stop sending water bills to residents until credits can be applied to those customers. Last week michigans governor approved a 30 million plan to help residents with their water bills. Flints water was tainted with lead after the city switched from detroits Water Department to the flint river back in april 2014. The city switched back to the detroit system last october. The knife reportedly found in o. J. Simpsons former estate most likely not connected to the killings of his ex wife and her friend. Gardeners and too small to make the wounds. That official says confirmation will take at least three weeks. We have more coming up on this warm weather that is going to effect the eastern seaboard. Today. Partly sunny. Highs in the mid to upper 70s. Friday. Mostly cloudy. Highs in the upper 70s. Saturday. Mostl y cloudy. A chance of showers in the morning. Highs around 70. Chance of rain 30 percent. Sunday. Mostly cloudy with a chance of showers. Highs around 70. Chance of rain 50 percent. Monday. Partly sunny with a chance of showers. A chance of thunderstorms highs in the mid 70s. Chance of rain 40 percent. Tuesday. Mostly sunny. Highs in the mid 70s. Wednesday. Sun ny. Highs in the upper 70s. And thats your latest weather. Coming up, no place for a brawl, the fight on a crowded plane caught on camera. Wait until you hear how this started. As people pay their final respects to nancy reagan her daughter speaks out in an exclusive interview. What she is revealing about the good and bad times in their first this is today on nbc. Come into Steak N Shake for handdipped milkshakes. 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Partly sunny. Highs in the mid to upper 70s. Friday. Mostly cloudy. Highs in the upper 70s. Saturday. Mostl y cloudy. A chance of showers in the morning. Highs around 70. Chance of rain 30 percent. Sunday. Mostly cloudy with a chance of showers. Highs around 70. Chance of rain 50 percent. Monday. Partly sunny with a chance of showers. A chance of understorms in thefron. Ghs in t ds. Chancoin percent. Uesday. Stly sunny. Isn e mid 70s. Ednesday. Sun ny. Highs in the upper 70s. Show. Former first Lady Nancy Reagans daughter speaks out ahead of her mothers funeral. Then were back with another steve today is your lucky y. Wo man surprised oh, my goodness mark youve just won a thousand dollars woman thats amazing thats amazing shrieks woman ok, nice job. Mark, way better than yesterday. Maria, that delivery felt a little forced. And steve, steve yeah . Woman i am still missing that raw emotion. Woman pretty awesome for a tuesday, but tomorrow is hump day, so lets really bring it lucky for life. Win a thousand dollars a day, 7 30 on a thursday morning, 10th day of march, 2016. Four days to go until an epic concert on rockefeller plaza. Next monday cold play will do their thing live on our concert stage. Wrangler said they are coming after i leave . Man hunt underway for at least two gun men who ambushed a Backyard Party outside pittsburgh. At least five people were killed and three others wounded. Hillary clinton faced a very direct question about the Ongoing Investigation into her emails controversy. Clinton admitted using a private email account while secretary of state was a mistake. Marco rubio is expressing regret over personal attacks he launched against donald trump. Its not something im entirely proud of. My kids were embarrassed by it. If i had to do it again i wouldnt. The republican candidates set to debate in miami tonight. Lets take a look at this scene on a flight from baltimore to los angeles. These are passengers having a fist fight in the aisle. This is a crazy story. Can you imagine being a passenger watching this play out . A group of women arguing throughout a fivehour flight. When the plane finally landed things got physical. It was an all out brawl caught on camera. On a Spirit Airlines flight as a plane full of passengers looked on. The last thing you want to see happen on a plane. Reporter the flight broke out. The ladies were serious. To be honest i felt like alcohol was definitely involved in the fight. Reporter Emerson Sylva and friends captured the video on cell phone. A lot of people were, stop nobody actually did anything. I saw the ladies swinging on each other, punching each other. The stewardess got punched. We stepped in and broke the fight. I sat the ladies down. Reporter the fight broke out between a group of younger and older women after an argument over loud music. Police responded taking away say no one was arrested or charged. So what caused the brawl . This morning we received an explanation saying prior to landing two customers who appeared to be intoxicated were playing loud music on a boom box speaker. Several other customers asked them to turn down the music. The first two ladies refused. They were holding it up in the air. This prompted the second group of customers to approach the first group and a fight broke out. I feel like i just did play by play in a boxing match. A boom box on a plane. Were no charges filed be