The heavy rain we have seen the last one to three hours here. Flash Flood Warning for Arlington County until 8 00 tonight and for Prince Georges County and southeast d. C. Until 7 30. Once again, looks like a water rescue going on right now through Prince Georges County. Please, i cannot say this enough do not drive through flooded roadways even pictures of it on my twitter and Facebook Pages this evening, dont let it happen tough. More rain coming through once again, following that same line, we call this training. As a result of a train, just like train tracks, the rain is moving over the same tracks well. Continue to keep you posted. Thank you, doug. Now to the technical glitches that captured headlines much of the day today from the impact on wall street to airports around the world. We have Team Coverage on all this begin with chris lawrence. He is at the live desk now. Chris . Jim, flights are still delayed on United Airlines and the dow jones lost more than 260 points by the closing bell. United, the Stock Exchange and government officials they are all blaming internal technical glitches. The new york Stock Exchange halted all trading on the floor when its system went down but the president of the Exchange Says there was no security breach. It didnt affect nasdaq and the other exchanges before the exchange shut down for four hours. The dow suffered sizable losses. The ground stop for United Airline also a ripple affect and delays throughout the night. The airline says a faulty router create and issue with Network Connectivity for severals of the software a kplax and that affected nearly 5,000 flights today. United says as a consolation it will waive the 200 change fee for customers impacted by the delays. Jim . Thanks, chris. President obamas Homeland Security adviser and his chief of staff kept him upgated on the issue of the Stock Exchange throughout the day. Press secretary josh earnest says that exchange was also in close contact with Homeland Security and the Treasury Department as well as the s. E. C. He says the government is vigilant in protecting federal government computer systems. The kind of security measures in place are sometimes obvious to the general public, sometimes they arent. We also work because types of Cyber Threats can change the measures they put into place are also constantly evolving. Joining us now with more on this is nbc news justice correspondent, pete williams. All this started the first thing we all think about is some kind of a cyber attack that has been ruled out. How do they rule that out . The first thing the government look and the, took and thought of it quickly, the agencies that watch internet traffic basically take a snapshot when Something Like this happens and try to go back and look and see what happens happening in the moments beforehand. They were confident, based on what the companies were saying this was into the cyber attack, united quickly said they thought it was a technical problem with one of their pieces of equipment. The Stock Exchange hasnt formally yet said what it was, it could have been change in software the night before. It was a reminder every can be do better, private city can do better with its own systems and the government a lot to do too. We heard today from several government offings they three times asked congress to require companies to more quickly report information to the government when these things happen, when a cyber attack happens and three Times Congress has said. No the companies worry about intrusions on privacy worry about legal liability, Congress Just cant do it. Today even though they werent Cyber Attacks there were reminders for the government it would be nice to have that aauthority. Our systems are vulnerable respect they . No such thing as a system that cant be attacked. The question is do the company does well enough . I talked to Mike Chertoff today the former Homeland Security secretary, who said the good news is the energy sec to the financial sector, do pretty well but what he called uneven elsewhere more the companies can do more the government can do. A changing landscape constantly. Yes, all these systems are under attack 24 hours a day. All right. Pete williams, thanks for being with us. You bet. We invite you to stay with us for continuing coverage of the technical glitches. There is much more ahead on nbc nightly news right after news4. Breaking news now in maryland, where traffic is backed up for more than eight miles. It happened after a state there were was hit by a car on i95 in howard county. We just learned the troop her pulled over a car and while he was talking with someone, another car hit him. Had is near the exit for route 32 on i95 southbound in jessup maryland. That trooper was airlifted to shock trauma in baltimore. At times, we have seen the south bound lanes shut down all together and at other times, one lane has been getting by that has all caused traffic to back up to the baltimore belt watch also causing major delays on alternate routes, such as the bw parkway. More breaking news now this time in baltimore, where the Police Commissioner has been fired. Mayor stephanie rawlingsblake announced today that Anthony Batts is out and deputy commissioner, kevin davis will take over. Davis was the assistant chief in Prince Georges County and chief in anne arundel before going to baltimore. Batts has been under fire because of the riots that followed freddy grays death and the spike in violence that has happened in baltimore since then. The change in baltimore comes on the heels of a scathing new report over the Police Response to those riots much the big headline is the riots could have been prevented. The after action report was done by the citys police union. Officers were told not to wear riot helmets in an effort to make protesters look like addressers. Police were also told not to spend to looting scenes or to a fellow officers call for assistance. A mistrial in the case of a convicted killer accused of hiring two hitmen to kill his uncle. After two days of club ray the jury could not decide whether to convict brian mayhugh. He is also serving a life sentence for a double murder. Prosecutors say mao hugh ordered the hit from jail. Tracy wilkins reports what is next on that place. This murder happened back on june 23rd. It was about 11 00 in the morning when police were called to the 1200 block of holbrook terrace in the trinidad section of northeast. Now, initially, the call was for a burning trash can but when they examined it closely, they found a body in that trash can that body was of 19yearold Heineken Mcneil and found he had been shot several times and that was indeed the cause of death. They announced today they made an arrest. They arrested 19yearold zakias blanding of northeast as well. Police chief lanier says they possibly live in the same neighborhood and at first, thought this was the result of some rival crew some bad blood between rival crews but turned out not tonight case at all. The result of a neighborhood feud. That belief sparked several days of other instances of violence. Well, with this arrest today, we have now learned that this, in fact, was not a rivalry or a feud between rival neighborhoods in northeast, but, in fact, the suspect and the victim were friends. Thomas harris had come into the district with his sister to get some crabs for a Church Picnic sunday afternoon. His death marks the 72nd murder in the city this year and tonight, nobody has been arrested our Mark Segraves spoke to the victims widow about that tragedy. Sunday afternoon, i get a call from my sisterinlaw that they said they wasntent to washington, d. C. To get the crab and buy fireworks. Reporter Thomas Harris and his sister drove into the district sunday afternoon from alexandria. Harris was walking down north capitol street while his sister waited in the car, about 5 in the evening. Harris sister had to tell his wife what happened. He said that the two person jump on him like they hit him on the head with a i dont know, a baseball bat, a small one, they always put in their pocket. And this has happened on new york avenue, washington, d. C. Reporter according to the police, the attacker robbed harris before running away. Witnesses tried to help but it was too late. The blow to harris head fractured his skull. He died the next day. His wife says she is shocked one would attack her husband because he was such a big man. s tall guy. And he knows how to defend himself. Thats why i was surprised because of how tall he is somebody do that to him, he should be fighting. I dont have no idea what is going on. Reporter is there a 25,000 reward for anyone with information leading to the arrest of the suspect or suspects involved in this latest murder. In the district, mark seagraves, news4. We have an update on that breaking news in howard county. Traffic is backed up for mile there is after a state there were was hit by a car on i95. The trooper was conducting a traffic stop near route 32 when the accident happened. Shomari stone is at the Police Barracks in jessup maryland with more. Shomari . Reporter thats right. Moments ago, i talked to the spokesperson for the Maryland State Police and tells me this there were was at a hospital, transported via shock trauma and we dont know his condition. Lets roll video of the scene. He was hurt in this twovehicle crash here in howard county, medics flew him via shock trauma and no word on his medical condition. We know all southbound lanes shut down traffic divert old maryland 175. Officials have not told us when they are supposed to reopen and say this will most likely last pass rush hour. A trooper pulled somebody over the 3 00, all of a sudden, a car hits the troopers cruiser then hits the trooper and the two other drivers were transported to the hospital. This there were, we dont know everyones condition. Right now the Public Information officer is gathering more details. We will post them on twitter and facebook at nbcwashington. Com as the information becomes available. Live shomari stone back to you in the studio. A top chef throws in the towel. Why jose an address dress says he had no choice but to back out of plans for a restaurant in Donald Trumps new hotel in the district. A new legal fight after the Government Data breach that had an impact on millions of federal workers. A tribute a Police Officer killed in a friendly competition. How people here are honoring him as the new trump hotel in d. C. Will no longer feature an andres restaurant. He isselfering twice trump because of the statements about mexican immigrants. Severing twice trump because of the statements about mexican immigrants. Trumps comments are starting to worry Republican Leaders looking ahead to the leeks. Trump is not backing down. He told nbc news he is confident he will win the latino vote. Steve handelsman is on capitol hill with that part of the story. Hi steve. Reporter trump charged today that the toppolling republican candidate, jeb bush, lacks energy but nobody would say that about the donalds performance. Everybody hates us. Vintage trump. Nothing to apologize for. Reporter in his interview katy tur they are drug dealers and krim moves into all kind. Reporter despite the blowback, corporations dumping deals and dropping pro, trump claimed at last tino voters love him. Fish. Get the nomination, i will win the latino vote, i will create jobs and latinos jobs they dont have now and i will win that vote. Reporter Hillary Clinton could not create jobs, said trump, or deal with mexico. She was the worst secretary of state in the history of our nation. Why would she be a good president . Reporter trump is polling second behind republicans, trailing jeb bush who some fear is being drowned out. Not going to listen to him, listen to donald trump and trump will steer this conversation aways. They are not helpful. Reporter trump calls it telling the truth. I dont need this. I dont need this. What im doing is for the country. I want to make America Great again. Reporter because he is rich and famous, trump says, he is getting respect. Republican insiders who do the do not respect trump say, in fact, he is damaging his partys ability to attract latino voters needed to win the white house. Im steve handsman, news4. Thanks, steve. A Union Representing 150 federal workers wants to protect their personal information. The national refresh rbi employees union says a lawsuit is the best way to do t they want improved security for the system as well as lifetime credit protection for employees much the union wants to prevent opm from collecting personal information electronically until the court is satisfied the system is safe. Over the weekend, the director of opm said program is being made in the data breach investigation and more information will be released soon. Doug is back with more of what seems like the almost daily Stormy Weather report. The nationals having a hard time the past couple of weeks getting their games in another time they have a significant delay. That is the least of our worries. We have dangerous situations out there right now, already a couple of water rescues that we have heard about. I have seen po people posting pictures of others on twitter and facebook riding right through areas of heavy rain dont do that flooded roadways. We will continue to see them. Look at this line. I have been showing the line close to three hours now, south of deal, the district portions of the manassas area, back toward the west. Fairfax county and this area right here really been in on it, see around Arlington County, threehour loop here, move back, actually still an hour loop here, you notice more rain continuing over the same area that has seen it. Clinton, maryland ongoing water rescue there right now, as somebody drove through high water and then the Fire Department has to come and try to get them out of that car. Flash Flood Warning continues for southeast d. C. And Prince Georges County until 7 30. Arlington county, continues until 8 00, a brief break but the heavy rain is now back in that area and will continue the next hour or so. Once again, look at the line extending back to the west around winchester. We are not done by a long stretch here. I think this line will pretty much stay where it the we were portion of it will continue to proceed to the north. The southern portion very slowly to the south. Wall cover, havent seen it, most likely be getting it in the next hour. Anywhere, we will continue to see the heavy rainfall, once again, give yourself extra time tonight. Flooding is occurring now, never drive through those flooded roadways. Going to see the flooding worries the next couple of hours. Gaithersburg, frederick havent seen rain quantico fredericksburg, culpepper, saying what problems thought . You have not seen the rain, just been warm and humid. Tomorrow, different story, today, it was hot and humid. Today very hot. High temperatures mid to upper mid90s at least, heat index the mid90s, cloud cover develop and storms will develop during the afternoon any storms that develop tomorrow could be strong folksily severe. Today the big eggs threat is the heaviest rain. Tomorrow i think the heaviest threat will be high winds along with heavy rain. Could see more flash flooding could see strong winds. That will be tomorrow night do not expect much during the day all be tomorrow evening, once again could affect the evening rush. High temperature, 93, d. C. 94, fredericksburg, 91, leesburg, 83, gaithersburg. You know we are going to have the heat, have the humidity, that heat index will approach 100 many areas. Next couple of day friday, looking good 89 lower humidity, 88 on saturday. Im still watching a front on saturday though some computer models give us a chance of rain. Im trying to leave it out. My daughters birthday party. Im trying to leave it out. Very important. It is a water you know, themed event. 29 on sunday. As we make our way on sunday, heat, humidity and chance of showers monday tuesday and wednesday. Thank you, doug. Still ahead, new reaction from Robert Griffin the third after the redskins lose their appeal to hold on to their trademark. More controversy about bill cosby. We will hear from d. C. s mayor about cosbys mural on the side wall at bens chili bowl. A 20piece silver set found next to a dumpster. Coming up at 6 00 how the woman who found it learned about the owner southwest is having a sale because when theres a reunion every cent should go to a killer dress. Never gonna get it by en vogue and heels. And a blowout. Mani pedi. Three weeks of tanning. Facial. A backup dress. Bronzer, lip gloss. Book for as low as 73 dollars oneway now at southwest. Com. Right knew lot of you are reacting on our Facebook Page for the judges ruling that ends the redskins trademark. Chris gordon joins us from fedex field with the thoughts of rg3 on all of this. Hi, chris. Reporter i caught up to him at a Community Appearance on behalf of his foundation. Thats why h