Announcer from nbc news, World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. The experts said all along it was inevitable, and now today confirmation of zika being acquired, not abroad or from travelers, but in the u. S. Because of mosquito bites. And experts say there will be more in the face of a looming pandem pandemic. The ground zero of the new infections, a neighborhood north of downtown miami. And tonight officials are taking extraordinary steps to see how far its gone and whos at risk. Kerry sanders is in florida with late details. Reporter early today control teams hit the new zika hot zones, now identified in south florida. Health Officials Say it is a first. One doctor calling this homegrown zika. Im directing the department of health to immediately begin contracting with commercial Pest Control Companies to increase spraying and mosquito abatement in the impacted area. Reporter mosquitos here in the United States likely biting one women and three men, mosquitos transmitting the zika virus to all four. Im almost certain were going to see more. The critical issue is how do you respond to that . Reporter tonight, anxious calls. You have reached the florida zika virus information line. Please hold while your call is transferred to the next Available Health care professional. Reporter tonight and this week state Health Officials are going door to door in the suspect neighborhoods, asking for urine samples trying to narrow down the zika threat. How are you feeling today . Urgent questions from south florida residents. Questions like leanette valero, 31 weeks pregnant, the threat now much more real. Avoid any places with standing water. Reporter the zika threat now, much more real. Ive been avoiding the winnwood area where its been reported. Reporter to prevent it from entering the critical blood supply, this lab is now testing donations, not just from south florida, but from the entire state, georgia, alabama and south carolina. Zika has now been found in all but four states, all those cases contracted while traveling outside the United States. But these four florida cases in miamidade and broward county, pose a new worry for Health Officials, that the threat is now here at home. Health Officials Say if you recently traveled to south florida on vacation, you should not donate blood in your hometown. Lester . Kerry sanders, thank you. To president ial politics now. After making history and taking aim at donald trump last night in philadelphia, tonight Hillary Clinton is off and running, hitting the road with her running mate tim kaine on her blitz through the rust belt and this weekend starting a 100day sprint to election day. Nbcs Andrea Mitchell has the details. Reporter the dynamic duo hitting the road in pennsylvania. As of tomorrow, we have 100 days to make our case to america. Reporter the road trip through the rust belt, clinton and kaine, blasting donald trump. Donald trump talks about make America Great again, he doesnt make a thing in america except bankruptcies. Reporter the first stop here in hatfield, 25 miles north of philadelphia, the Clinton Campaign trying to rebottle the magic of another Clinton Campaign, 24 years ago. What a night reporter back in 1992, it was the clintons and the gores, a political buddy movie. A great crusade to give the American People their country back. Reporter but now bill clinton is the spouse. Im excited to have the 42nd president of the United States as part of this team. Reporter while Hillary Clinton is making history i accept your nomination for president of the United States. Reporter at a convention designed to fix what polls stay are her biggest problems, honesty and trust. I get it that some people just dont know what to make of me. Reporter and softening her image with a touching introduction by daughter chelsea. I always, always knew how deeply they loved me. Reporter but so much of Hillary Clintons focus last night, the contrast with donald trump. A man you can bait with a tweet is not a man we can trust with nuclear weapons. Reporter now a critical trip in a usually safe blue state that trump is targeting, some say that pennsylvania is now in play. Im not surprised that the Trump Campaign looks at the figures and says we have a pathway to victory. Reporter but if clinton can stop trump in the rust belt, he likely wont be president. Andrea mitchell, nbc news on the road with the Clinton Campaign. As you might expect, donald trump isnt taking any of this sitting down coming out swinging and late today raising some eyebrows to a crowd chanting lock her up referring to clinton. Nbcs Halle Jackson is on the road with the Clinton Campaign in the critical swing state of colorado. Reporter donald trump unsurprisingly unimpressed. I watched her last night giving a speech that was so average. Reporter promising more attacks on Hillary Clinton to come. Audience lock her up you know what . Im starting to agree with you. Im taking the gloves off, right . Yes . Take the gloves off. Reporter today attacking Hillary Clinton and others who hit him on the dnc stage, but staying silent for now about one of the most powerful moments of the night. God bless you, thank you. Reporter by a man named khizer khan, whose son was killed in 2004 in iraq. Let me ask you, have you even read the United States constitution . I will i will gladly lend you my copy. Reporter today, khans heading home to virginia. The reaction had been overwhelming and encouraging as well. Reporter after khan directed this message to trump. You have sacrificed nothing and no one. Reporter at the same time, trump was delivering his own message on the campaign trail, reiterating his support of water boarding. They can cut your throats, we cant water board. You know, were playing by different rules. Reporter a striking contrast in a tale of two speeches. Khan hopes his will convince gop leaders to reconsider backing their nominee. That will save the sinking ship of the entire republican party. Reporter khan undetoured but change, unlikely. Some political analysts say khans speech while heart field may move the needle for Republican Voters but did move the dial online with reports today, google searches spiked during and after khans speech, with people looking up how to register to vote. Hallie jackson in colorado, hallie thank you. Now to a case that could have implications for the election in another key state, a swing state, North Carolina, where today one of the nations toughest voter id laws was thrown out. A federal court said the law was designed to make it harder for africanamericans to vote. Our justice correspondent Pete Williams takes us inside the case. Reporter voters in North Carolina will not have to show any kind of photo id at the polls, the result of a federal Appeals Court today striking down the states voting law passed in 2013. In a blistering decision, the court said the state legislature explicitly set out to discover what kind of accommodations minority voters use most often and then roll back and eliminate them. The court said the restrictions target africanamericans with almost surgical precision. Using race as a proxy for party may be an effective way to win an election it said but that constitutes discriminatory purpose. Were thrilled, we think this is a huge win for voters. This is an effort to overthrow the will of the people on voter id and ballot security and it is led by the democrats. Reporter but todays ruling said the state failed to identify even a single case of inperson voter fraud in North Carolina. The law also cut early voting by a week, ended sameday registration and stopped a program to let 17yearolds preregister, all now struck down. In the past two weeks, federal courts have now rolled back voter id and other voter restrictions in North Carolina, wisconsin and texas. These rulings could be appealed to the Supreme Court but the closer it gets to election day, the less likely the justices are to step in and rule again. Pete williams, nbc news at the Supreme Court. Two suspects are now in custody in san diego after one Police Officer was fatally shot and another one was badly injured. Officer jonathan deguzman, a married father of two was killed. One suspect who also had gunshot wounds was caught near the scene, the other was arrested at a home in a standoff not far away. Sources say this may be gang related, and theres no indication that the officers were specifically targeted. In michigan, six additional state workers Face Criminal Charges in the city of flints toxic water crisis. They are all health and environmental employees accused of hiding data on unsafe lead levels. Thousands of children were exposed. In april, two state raeg regulators and the Water Quality supervisor were also charged. Turning overseas now with a rare new look inside syria, where time is running out for thousands of civilians, many of them children trapped by war. Now theyre being told they have a chance to flee syrias largest city which is under siege from rebel forces targeting rebelheld areas but as our Richard Engel reports, many may never get out. Reporter 4yearold mariah, somehow managed to keep her angelic smile in the midst of war outside damascus. With jets overhead, her father encouraged her to pray, to stay calm. But her prayer was interrupted. By an explosion nearby. Mariah survived. But across syria, the government of bashar al assad, backed by extensive russian help is on the offensive. And nowhere the situation more dire than in aleppo, troops are moving in. The combined syrianrussian offensive has intensified bombing of aleppos main hospitals. Nbc news obtained images taken just after one of the bombings. Hospitals turned into killing fields. A little girl, injured and unattended in the midst of chaos. The hospital is out of service completely said a nurse, and without it, even the smallest injury could lead to death. There are 350,000 civilians trapped in aleppo and theyre running out of everything, even food. This familys refrigerator, like so many others near empty. Russia and syria now still open a socalled humanitarian corridor for people to leave aleppo. Activists say its just a way to empty the city before a complete attack and possible takeover, the untold suffering of the people of aleppo may be just the beginning. Richard engel, nbc news. A somber and moving scene today at auschwitz, pope francis making a mostly silent pilgrimage to the nazi death camp in southern poland where the german occupiers murdered more than a Million People, mostly jews. His words were written mostly in spanish, lord have pity on your people, lord forgive so much cruelty. Still ahead tonight, you probably know the feeling, getting driven to the brink by Bad Customer Service calls. Turns out some Companies Make it so frustrating on purpose. How you can finally end the run around. Also we take to the air over rio, with just one week to go before the start of the olympic games, the burning question, will it be ready . Were back now with the frustration so many people can relate to. Those rage inducing calls to customer support. You may be shocked to find out Many Companies are making the experience so miserable on purpose. But nbc newss Olivia Stearns has ways you can fight back. Reporter after 10 hours on the phone with Customer Service, gena had had enough. The whole thing made me angry, upset, totally frustrated. Reporter the North CarolinaBusiness Owner was staring at 1,000 in bills for phone service she thought she cancelled months ago. I would get transferred from department to department, usually its the wrong dep. This went on for five months. Reporter gena was caught in the Customer Service department runaround. 74 of Call Center Managers admit they prevent the best possible service. In part, to wear you down until you give up on cancelling. Justin robbins spent 12 years in a call center. Youre telling me im deliberately being given the run around . In some of those situations, you are. Some companies have engineered it so that if you have an issue, unless you, the customer and the agent can complete it within a certain amount of time, you have no other choice but to go to another channel, a different agent. Reporter what can you do . Always ask for a case id and for a direct number to call back before you get transferred. And download apps like fast customer that will actually wait on hold for you. Please hold for the next available representative. Reporter so when i hear that . You can press within the app, the star key twice. Reporter after we got involved, gena finally got to cancel her service and spend a lot less time on the phone. Olivia sterns, nbc news, new york. When we come back, are your eyes playing tricks on you or is this volcano saying, have a nice day . Well, theres excitement building in rio. One week before the start of the summer olympics the athletes are there preparing and our team has made their way there as well, amid lingering concerns about whats in the water. Nbcs Miguel Almaguer has it all covered. Reporter good evening from the beautiful skyline just above rio where the stage is nearly set for the summer games. The view from just 200 feet above this city is spectacular, as brazil races to put on the final touches here just one week before opening ceremonies. We soared over olympic park last year, and when we were on the ground 12 months ago, there were questions, would they be done in time here . Today we know the answer, the venues are all finished, athletes are training in many of them today. There are still some concerns over Water Quality conditions in the bay where many events like sailing will take place. But olympic officials tell us the water is being tested every day and theres no reason now why the events wouldnt take place. Tonight security is also tightening across this city as well. The police tell us half a Million People are beginning to arrive here in rio and theyll continue to come over the next several days. There is excitement here in the air, lester, we are one week out. Lester, back to you. And a program note, our nightly News Coverage from rio starts thursday night. We will begin broadcasting live there then and throughout the games. An extraordinary picture out of hawaii captured what may be the happiest volcano on earth. Take a look at this. The viral image shows the kilauea volcano. And does that look like a smiley face appearing to form in the lava . Sort of. Kilauea, one of the worlds most active volcanos has been erupting since may. When we come back, the election could come down to key voters in battleground states. We asked voters are they leaning trump or clinton . Finally tonight, now that the 2016 political conventions are in the history books, were just about 100 days from the election. And as you know, a handful of states could make the difference between a donald Trump Presidency or a Hillary Clinton white house. Our Cynthia Mcfadden went to one such battleground, ohio to see how voters there are leaning. Ive been a life long democrat and im done. Do you believe her lies . They have forgot the white middle class. Reporter theyre the voices that could help decide this election. I dont trust either one of them. Reporter we came to youngstown, ohio a traditionally democratic town to see how voters in the heart of the rust belt reacted to the conventions in cleveland and philadelphia. Do you think the Democratic Party has left you . Reporter like many of his listeners, ron verb has been a loyal democrat all his life. But after 30 years on the radio here, hes supporting his first republican, donald trump. The problem is we have lost too many good jobs. Reporter not everyone in town agrees, we ran into one of his listeners on the sidewalk. On the Democratic Party, i think i have a chance, i really do. It seems like when trump gets in, hes going to say this is the way its going to be and thats it. Do you know what thats called . Leadership. Thats called dictatorship. Reporter industrial jobs have dried up over the past 40 years and unemployment is high. And the democratic voters in youngstown, it will be key in winning the white house. So important, Hillary Clinton comes here tomorrow. Ohios non collegeeducated voters are going strongly for trump. 43 to clintons 36. And in this county alone, a notable 6,000 democrats have switched over to the republican party. But after watching the conventions, there is still plenty of undecided voters like democrat anthony villio, whos impressed with trump. Hes like me, hes a republican. Reporter but hes a billionaire. Hes a billionaire, but hes just like me. Reporter ron says after watching the convention, hes still for trump but has concerns. Im voting for trump, but im really concerned and its a leap of faith to vote for trump. Reporter the question is how many others are willing to take the leap with him . Cynthia mcfadden, youngstown, ohio. Thats going to do it for us here on this friday night, im lester holt. For all of us here at nbc news, thank you for watching and good night. Right now at 6 00, a horrific wreck. A teenager is dead, fire others injured after a crash in the south bay. Lanes are shut down right now as Police Investigate this crash. The news at 6 00 starts right now. Thanks for joining us this evening. Im janelle wang. Im peggy bunker. Raj and jessica are off tonight. We begin with this developing story in the south bay, a car crash at a busy intersection in santa clara. It happened at lafayette and montague expressway, near the river mark village in santa clara. Thats why we find ian cull with more. Ian, youre at the scene. What can you tell us . We know theres been one fatality and a few others injured. Reporter what police are saying is that the white chevy pickup was traveling southbound on lafayette when something muff happened that caused it to veer off and hit the traffic pole. Now, witnesses here say that they believe that the truck was going the speed limit when this happened around 3 13 this afternoon. Emergency crews and medics rushed to the scene here. Inside the truck, a 15yearold girl, a passenger, was killed. Five others in the truck were injured and taken to local hospitals. Police say their injuries are not lifethreatening. Police are trying to find out what happened here. The passengers are just being interviewed now. No other cars are hit, although investigates are on scene blocking part of the intersection. Northbound lanes of lafayette are open. As we come back out here live, you can see one of the investigators advan