Nightly news begins right now. This is nbc nightly news with lester holt. Good evening. We start with an urgent warning. Government safety regulators have taken the rare step of urging owners of some 300,000 cars to stop driving them immediately because of a high risk of potentially deadly air bag ruptures. The cars, hondas and acuras are part of a broad recall of defective air balancings affecting millions of makes and models linked to numerous deaths and injuries. The government tonight telling drivers of specific models to park them until theyre repaired. Miguel almaguer has details. Reporter the defective air bags can explode spraying shrapnel into the driver. More than 100 people in the u. S. Have already been injured and ten killed including teenager huma who was driving this 2002 honda sick. The massive takata airbag recall was first made eight years ago, but no data shows those who havent made the fix face serious danger. We have brandnew Laboratory Testing thats showing some of these older models could have a 50 rupture rate. Reporter the government estimates 313,000 cars, some of the most popular brands on the road, are at risk. 2001 through tt 2003 model honda and acura models are at the center of the recall. Im here for the air bag service. Reporter paul jaffe isnt taking any chances in his 2001 civic. Should you have that accident, you want to make sure that youre going to be safe and that your air bag will work properly. Reporter honda says 70 of the cars that need the fix have been repaired. The government says the other 30 of drivers need to get off the road immediately and take their cars straight to the dealership. The new test results reveal the danger is greatest in hot, damp places like florida and along the gulf coast where air inflaters can malfunction causing potentially deadly explosions. Corey burdick lost an eye when his air bag exploded last may. I just thought im going to die. Right here on the curb, this is it. Reporter tonight the government is desperately trying to find 313,000 drivers who may survive a crash but not the air bags designed so save their lives. Miguel almaguer, nbc news, los angeles. And meantime, late today auto safety regulators also announced theyre settinging a fatal crash involving a 2015 tesla model s in which the autopilot or automatic driving system was being used. It is believed to be the first deadly crash of a selfdriving car on autopilot. Tesla says the nhtsa action is simply a preliminary evaluation to determine whether the system worked according to expectations. The Company Notes this is the first known fatality in 130 million miles with autopilot was activated. With some 43 million americans expe s expected to t this Holiday Weekend theres concern and uneasiness over the threat of terrorism driven home by the sent attacks in istanbul and orlando. Airports will be busy and seeing extra scrutiny. Big City Police Departments plan on making sure their heavily armed Tactical Units are a heavily visible deterrent. Heres nbcs tom costello. Reporter two days after the attack in istanbul halfway around the world, the nypd Critical Response unit is on the streets and on alert in times square. Across the county in l. A. County extra special ops teams are working train stations and public areas. I dont think people should be afraid but they should be more aware. Reporter rollouts in a miami airport, in d. C. And in chicago. Contributing to a growing sense of unease the attacks in paris, san bernardino, belgium and now iz stan bull. Since the brussels attacks in march, theyve beefed up security at airports nationwide. The American Public should expect to see this july 4th weekend an enhanced security presence at airports, train stations and other Transit Centers across the country. Reporter following istanbul and brussels, many Aviation Security experts worry u. S. Airports are vulnerable. Weve not paid enough attention to the airport Facility Security despite that fact that theres a long history of attacks against airports. Reporter meanwhile, preparing for the fourth of july weekend on the National Mall, u. S. Park police under orders from the chief. Be prepared and be aware. Reporter the challenge for police around the world cracking small terror cells that can pick their target at will. People should not allow isis to be their travel agent or to be their National Security advisers. They will act when and where they want. If an incident occurs in the United States, it is going to be isolated. It will probably be an individual. Reporter back here on the National Mall where theyre preparing for a very big weekend and a big influx in tourists, police here say they prepare every day in washington as if they could face a national, a big emergency, but they say that theres no information any attack is imminent. Lester . All right, tom costello in washington. Thank you. In turkey today raids across the country in more than a dozen people now in custody in connection with the airport terror attack that killed 42 people in istanbul. The sweep comes as we learn new information on the three bombers, where they came from and where they may have spent their final days. Kelly cove yell la has the latest. Reporter new security cameras showing panic in the terminal. Now a closer look at the faces of the three men who caused it, bombs hidden under winter coats, weapons in luggage. Nbc has not yet verified these images but a Turkish Police source says one was from russias caucasus region, the same area as the Boston Marathon bombers, the other two from uzbekistan and kyrgyzstan. At least one arrived in turkey a month ago from the isis stronghold of raqqah in syria. Turkish media saying the three attackers rented an apartment on this busy istanbul street paying for three months up front in cash, adding a security door, keeping the windows shut and curtains drawn. Inside a strong chemical smell, according to one neighbor. Turkish Officials Say the explosives used in the attack were military grade. This is the heavy security door, and neighbors say the bomb squad, forensics and special forces have all been here. One of more than a dozen raids across istanbul and the coastal city of izmir. Turkeys interior minister said 13 are in custody in connection with the airport attack. The fight against isis in this country and on the frontlines intensifying. Coalition bombs rained down on an isis convoy south of fallujah, wiping out hundreds of militants fleeing the city. In turkey today, memorials and more funerals. These workers were on their way to bury a friend. How do you feel today . Still in shock they told me. Among the dead, cab drivers, cater caterers, an airport employee a week away from his wedding. We saw a lot of airport employees in tears today as they tried to get on with their work. This is the seventh terrorist attack in turkey this year. Lester . All right, kelly, all this creating a climate of anxiety. We saw that here at home, the u. S. Air base thats home to the president ial aircraft this morning when a report of an active shooter sent joint base andrews in maryland on lockdown. Personnel were ordered to shelter in place. But it was a false alarm. Someone mistook an active Shooter Drill for the real thing. The allclear was given after about an hour and a half. A tense hour and a half, we note. History and controversy as the pentagon lifts its ban on Transgender Service members serving openly. Its a move being hailed by many but questioned by others. The head of the Republican HouseArmed ServicesCommittee Said its the Obama Administration putting politics over policy. Our pentagon correspondent Jim Miklaszewski tells us more. Reporter after a yearlong study, defense secretary ash carter has lifted the last genderbased barrier in the u. S. Military. Were ending the ban on Transgender Americans in the United States military. Reporter for the first time as many as 12,000 transgender men and women now in the military will be able to openly serve without fear of being discharged. And transgender recruits will be accepted by the military services. What it means is that transgender troops can serve openly. They dont have to live in fear. They dont have to lie about who they are. I felt very betrayed. Reporter sage fox first served in the army as a male infantry soldier, but years later after sage was recruited into the Army Reserves as a transgender woman she was quickly pushed out and put on inactive status. Its fear, ignorance, bigotry, misinformation. Reporter lifting the current ban will not come fast or easy. The military Services Must come up with plans to provide psychological counseling and medical services for transgender forces including hormone treatment and, in some cases, sex change surgery. It could take a year before the plan is fully implemented, but as for sage fox, shes elated and looking forward to returning to active duty. Jim miklaszewski, nbc news, the pentagon. There is more controversy tonight not on the campaign trail but on the tarmac of arizona. Bill clinton bumping into the current attorney general of the United StatesLoretta Lynch. The two talking for a few minutes. The optics of the chance meeting causing an uproar because it comes at a time when the Justice Department is looking into Hillary Clintons use of a private maemail server. Andrea mitchell has details. Reporter bill clinton on a Campaign Trip in arizona, attorney general Loretta Lynch visiting the phoenix police. They run into each other on the tarmac at the airport. Its 108 degrees so they board her government plane along with her husband and visit for 30 minutes. There was no discussion of any matter pending before the department. No discussion of benghazi, no discussion of the state department emails. Reporter saying it was social about golf, grandchildren and visits former attorney general janet reno who is ailing. But with the Justice Department investigating Hillary Clintons emails on radio today, donald trump pounced. I think its so terrible. I think its so horrible. I think its the biggest story one of the big stories of this week, of this month, of this year. How bad a judgment is it for him or for her to do this . Reporter the attorney general says the email investigation is being handled by career agents who follow the facts and the law. But critics, even some democrats say it could raise suspicions. David axelrod tweeting i take Loretta Lynch and bill clinton at their word that their convo in phoenix didnt touch on probe, but foolish to create such optics. The president not answering a question about it late today. Thank you very much, everybody. Reporter tonight a growing uproar as judicial watch, a conservative group that sued for clintons emails, is demanding an Inspector General review claiming the encounter undermines Public Confidence in the email investigation. Andrea mitchell, nbc news, washington. Just as millions of americans prepare to get some sand and sun this fourth of july weekend, floridas governor has declared a state of emergency erov a massive invasion of toxic algae in communities and beaches along floridas east coast. Nbcs Gabe Gutierrez has more on whats forcing swimmers to keep their distance. Reporter tonight the hopes of floridas Treasure Coast are sinking. Rivers and beaches coated in toxic bluegreen algae, the stench forcing some to wear masks. Its awful. It really is. Reporter the governor declaring a state of emergency in four florida counties. The water is stagnant. So it all collects up. Youre smelling the rotting algae. Reporter one family in stuart spotting this manatee struggling in a canal behind their home. When we turned the water on, it immediately came up and started washing his face off. Caught him coming up from the water and the muck having a hard time breathing, spitting out out of his nostrils a lot of the green algae. Have you ever seen it this bad . No. Reporter Martin County commissioner doug smith wants federal aid. Its awful. When i say its a collapse of the ecosystem, thats being light about it. Reporter he and other county officials blame the problem on what happens to the west on lake okeechobee high temperatures and heavy rain have targeted a heavy algae bloom. To keep the lake from flooding surrounding homes and to relieve pressure on the dike there, the army corps of engineers released the excess water into rivers spreading the toxic algae. People said they would not rather bring their boats in. Reporter for a manager at a local marina, the timing could not be worse. Right before the fourth of july. Everybody wanting to use their boats. Now they will not be. Reporter this week several beaches were shut down. Authorities are now watching this water closely ahead of the crucial Holiday Weekend. At this marina, the algae is particularly bad. Lester, the stench is just awful. Late today the army corps of engineers said it would reduce the flow of water from lake okeechobee. Gabe, thank you. Still ahead tonight, he spent 16 years behind bars for a murder he says he didnt commit. Now the prisoner who captured the nations attention on the pod cast sensation serial gets a new shot at winning his freedom. 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She was found in a shallow grave. Adnan her boyfriend was put on trial and convicted. A podcast serial turned it into a national phenomenon. He maintained his innocence. Man, i had no reason to kill her. Reporter questions were raised about the strength of the prosecutions case and even about the effectiveness of syeds lawyers and their failure to contact potential alibi witnesses. Late today a huge payoff for all that attention and work by his current lawyers. A judge ordered a new trial citing questions about the reliability of cell tower location evidence used to show where he was when the crime was committed. His legal team said syeds family is overjoyed. They were at times speechless. So i had to check to make sure the phone line had not gotten cut off. But theyre delighted. Reporter reaction was immediate on social media. One woman tweeted that she was sitting on the beach alone with tears of joy streaming down her face. In his ruling tonight, the judge said the case representing what he called a unique juncture between the criminal Justice System and strong public interest. But judge martin welch said he tried his best to address the legal merits of the request for a new trial and to treat it like any other case unfettered, he says, by sympathy, prejudice or public opinion. Pete williams, nbc news, washington. Were back in a moment with michael phelps, the most michael phelps, the most the ford freedom sales event is on with our best offers of the year im free to do what i want. And 0 financing is back on a huge selection of ford cars, trucks and suvs. Plus get an extra 1000 smart bonus on specially tagged vehicles. Thats freedom from interest. And freedom to choose with ford. Americas best selling brand. Im free, baby now get 0 financing plus a 1000 smart bonus cash on specially tagged vehicles. Only at the ford freedom sales event. Feel free. 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