Good evening and it is great to be with you on this labor day. It is an honor to begin this journey with you. And we begin tonight with that developing story, word of a crash at sea and a stunning rescue. A marine corps helicopter, 25 sailors and marines going down off the coast of africa. All of them survived, and abcs chief Global Affairs correspondent Martha Raddatz leading us off tonight. Martha, good evening. Reporter good evening, david. Its amazing that everyone got out alive in a crash like this involving one of these big topheavy helicopters that have a tendency to flip over and sink fast if they hit the water. It was a super stallion helicopter just like this one seen here approaching this same ship, the u. S. S. Mesa verde last month. You can see the landing spot on the deck clearly marked, but landing these big helicopters in the wind and the waves on moving ships is challenging. Todays accident happened on approach. An official says it hit the ship just before it was about to land and then crashed into the sea. This was a shock, bang, bang in the water. Reporter the ship immediately launched a small boat to help rescue the 25 on board, all trained for exactly this kind of accident. They learn to overcome that initial fear and understand that selfcontrol is whats going to be the key to survival. Reporter only one of those aboard sustained significant injury but not bad enough to require evacuation from the ship. These super stallions are one of many types of helicopters at sea, as we saw during a trip to the gulf of oman. Vital to missions around the world, especially the volatile mid east. Martha is back with us live from washington. Any early word on a cause here . Reporter theyre not sure what caused the crash, whether it was mechanical or a crew error. It certainly wasnt hostile action. Tonight everyone is just happy that everyone is safe, david. Including us, Martha Raddatz starting us off tonight. Thank you. Were going to turn to the other developing headline tonight, millions of americans driving home after the Holiday Weekend back to work and school. But first driving through horrific weather. Look at this tonight, golf ball sized hail pounding cars in kansas leaving a lot of damage in its wake. There was this, a shelf cloud over parts of iowa, 80 Miles Per Hour winds right behind it. Take a look at the weather wall tonight, every dot up there on that map a burst of Severe Weather reported on this labor day weekend. More than 180 reports of Severe Weather. Tonight there is more on the way. Reported tornados touching down today and millions in the storm zone. Abcs meteorologist ginger zee tracking it all. Reporter as millions attempt to enjoy summers last gasp, Mother Nature laboring on labor day. Parts of michigan erupting with severe storms. An inch of rain fast filling the streets outside grand rapids. In worcester, massachusetts sunday i heard crash. I thought it was hail and then boom, boom, boom, crack, crack, crack. It destroyed two of my cars. Reporter an efzero tornado ripping a path just under two miles long. Its incredible. You dont expect to have tornados in worcester. I mean, we dont live in kansas. Reporter its actually the sixth tornado reported in massachusetts this year. But shes right, its not kansas. This one, the hail raining down, growing to golf ball sized. Those sinister shelf clouds creeping across the planes. Inside gusts up to 80 Miles Per Hour. At least five people from kansas to new york city struck by lightning. Stunning pictures this labor day weekend. Ginger, what are you watching tonight . A severe thunderstorm watch in place for parts of oklahoma and kansas. Let me take you straight to the map. Right through missouri into southern illinois, thats the threat area tonight. That same cold front that produced reported tornados in michigan will sink to the south and east. Western new york down to central kentucky were watching tomorrow for those damaging winds floods and large hail Late Afternoon and evening when everyone is getting back from their commute. Finally, the tropical depression looks like it will become Tropical Storm dolly in the next 24 hours, going to about 200 miles south of brownsville. Right there in mexico. If this becomes dolly it is the d. In the alphabet of the Tropical Storm season, the hurricane season. The last time we waited this long for d. Was 1994. 20 years ago. A long wait but thats okay with us. Ginger, thank you. Were going to turn around the world and to a new crackdown this evening aimed at stopping budding terrorists in their tracks. The proposal in britain comes two weeks after that gruesome image, that killer who executed american james foley. The mysterious hooded man with what sounded like a man with a british accent. British authorities upping the threat level tonight saying it is time to seize the passports of suspected terrorists to prevent them from leaving the u. K. To fight in syria and iraq and prevent them from joining isis. Back to this country tonight and to an eyeopening abc news investigation here. With all of that concern in britain over homegrown terror, news tonight 6,000 foreign nationals have traveled here to america and have disappeared. How did they do it and were any of them sneaking into this country . Abcs chief investigative correspondent brian ross tonight. Reporter for a down payment of just a few hundred dollars, there is a much easier way for people to sneak into the country than this. Heres how. Get a u. S. Student visa to go to school and then disappear. As of today, u. S. Authorities are investigating the whereabouts of more than 6,000 foreign nationals who arrived in the u. S. On student visas and have vanished, their intentions unknown. They just disappear. Reporter thats just what happened with the 9 11 hijackers who flew the passenger jet into the pentagon and Authorities Say the problem continues. Its been pointed out over and over again. The fact that nobody has done anything about it yet, thats a very dangerous thing for all of us. Reporter its a well intentioned program that allows more than a million foreign students a year to study in the u. S. But an abc news investigation found Homeland Security also certifies 86 beauty schools, 36 massage schools, and nine schools that teach horseshoing, all valid for a u. S. Visa. Why a horseshoing school . What is the value in that for the u. S. . Im not too sure what the value of that for the u. S. Would be, brian. Reporter peter edge heads investigations for i. C. E. , immigration and customs enforcement. I do agree its a problem, brian. They have blended into the landscape. They have blended into the landscape. Its like disappearing, isnt it . Virtually. Reporter i. C. E. Agents have brought criminal charges in some cases, including against five top administrators at whats called the micropower institute in new york, where Authorities Say they essentially offered an easy path to u. S. Visas for the price of tuition. Can you please leave the premise. Reporter none of the administrators would come out when we showed up and have pled not guilty to visa fraud charges. Incredibly, despite the indictment, the operation remains on the Homeland Security list of schools certified for foreign student visas. Here it is right here. Right. How can they still be on that list of certified schools . Brian, i can only say this is the United States of america and everyone has due process. Reporter in the wake of the 9 11 attacks there were calls for tighter rules and faa approval for u. S. Flight schools that train foreign students. In the most recent audit, more than a third of the flight schools accepting foreign students still had not been certified by the faa. A lot of questions unanswered. Brian, thank you. Were going to turn to the Syrian Border with lebanon where we know isis has taken a new and stunning number. More than half the population in lebanon are now refugees from syria. In fact, more than 3 million syrians have now fled, many of them children. Look at this tonight. Our cameras were right there on the Syrian Border where i learned children dont board school buses, they board pickup trucks, taken to work in the fields, supporting their families at eight, nine, ten years old. They come from middle class families, their parents once teachers, lawyers, and now they are the ones supporting their parents. Tomorrow night right here were on those trucks for those grueling days in the field. Is anyone looking out for the children . Thats tomorrow night here on world news. President obama preparing to head to europe for a crucial meeting of World Leaders this week. What to do about russia and ukraine. Weve learned n. A. T. O. Is planning to launch a Rapid Response team that can deploy a strike force, several thousand troops in as little as 48 hours. To iceland tonight and to some remarkable images coming in. An ancient volcano roaring back to life, spewing lava 200 feet into the air. A monster cloud so big the aviation experts raised levels to its highest level, banning all flights beneath 6,000 feet. That code red has been lifted. Back here at home tonight and the hunt is on for this man in this surveillance tape considered armed and dangerous nicknamed the ak47 bandit. You can see why. Wielding a powerful assault rifle. Thats not all. Authorities pointing to one thing tonight, the word written across his vest, sheriff. The suspect claiming to be a former Law Enforcement officer. Will he be caught before he strikes again. Abcs cecilia vega tonight with the tape. Reporter tonight across the west, the all out manhunt intensifying for this masked man, wanted for five Bank Robberies in four states, most recently making off with a duffle bag full of cash in nebraska. Each time wielding an assault weapon and often wearing a bulletproof vest. Were going to track this guy down wherever he goes. Reporter Authorities Say his spree began two years ago here chino, california, the bandit robbing a bank, shooting and seriously wounding a Police Officer. He fired four shots at the car, boom, boom, boom. Reporter the fbi suspects he called in a bomb threat as a diversion. 911 emergency what are you reporting . I have a bomb. This is not a drill. Do you hear me . Reporter the ak47 bandit has shown such proficiency with a gun, the fbi tells me its now looking into the possibility that hes a former Police Officer or ex military. During one idaho heist police say he bragged about being a former officer. Look at these surveillance pictures. Hes seen wearing a sheriffs vest. If youre willing to shoot a Police Officer, youre probably willing to do just about anything. Reporter the fbi hoping to catch this bandit last seen carrying that ak47. Cecilia vega, abc news, chino, california. Cecilia vega, thank you. Were going to turn now to that blockbuster medical headline involving the number one killer in the world, Heart Disease. Were learning about an experimental treatment being called a potential breakthrough, so promising they stopped the study in the middle of it all. Now the next step is fda approval. Lets get right to abc senior medical contributor, dr. Jenn ashton. You were telling us this is a big deal. Reporter actually absolutely, this is the first drug of its kind in pill form to treat heart failure. This is a combination of two drugs and in this study which was the largest ever done for heart failure, it was found to reduce deaths from Heart Disease by 20 and improve quality of life. 20 , thats a staggering figure. How long will it take to get approval and get it out there . First it needs to be studied more in africanamerican patients and women. If the fda approves it, it could be available as early as 2015. Highly significant and very optimistic. Dr. Ashton with us here. Doctor, thank you. As america heads back to work after labor day were not heading back to a paycheck like this one. One of the biggest endorsement deals in sports history, nba star kevin durant, our partners at espn reporting that nike is offering durant 300 million over the next ten years to stay on. The deal negotiated by superstar jayzs company, rock nation sports, just as durant was considering leaving nike for another sports wear company. Durant tweeting, excited and humbled to sign back with the swoosh. Theres much more ahead on world news tonight, that big headline today, the famous faces who say their private photos were stolen. Tonight we ask how safe are your photos on your computer . The answer is eye opening. The vacation hero, the man on his balcony who spotted not only the swimmers but the hammerhead shark. What he did next, hes right here tonight. And youve got to stay tuned for this. Americas future tonight, kindergartners from all over the country getting ready and whats the one thing theyre most excited about. They made us laugh. Dad,thank you mom for said this oftprotecting my future. You. Thank you for being my hero and my dad. Military families are uniquely thankful for many things, the legacy of usaa Auto Insurance could be one of them. If youre a current or former military member or their family, get an Auto Insurance quote and see why 92 of our members plan to stay for life. When i had my first migraine, i was lucky. That sounds crazy, i know. 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Reporter an invasion of privacy tonight, impacting some of the biggest stars in the world. Personal photos of some alist celebrities were reportedly posted on photosharing site 4chan, allegedly obtained by hacking cloud accounts, those huge servers that can automatically back up every picture you take on your phone. Even if you have deleted photos from your phone, oftentimes theyve already been uploaded into the cloud. They continue to exist. Reporter apple said today they are investigating if their icloud service was breached. But researchers say many of us are making it all too easy for criminals to access our most private information. We are cruising the streets of new york, scanning for unprotected wifi networks. Currently we have 260 networks and weve traveled about what, one yard . Reporter security expert Chester Wisniewski finds almost a quarter of Wireless Networks have weak or no protection. Leaving emails, financial accounts, everything exposed. I can see their instant message conversations, the photos theyre sharing. Reporter and when youre on the go, remember that free public wifi comes with a privacy risk too. Is it safe for me to go on there . Its very easy for an intruder to see pretty much everything youre doing. Reporter its an opportunity for hackers, some setting up fake wifi hot spots to entrap you. When we set up a free network called free public wifi we got three androids, two iphones and an ipad. Reporter users were logging in in less than five minutes. Some simple tips. Put your router near the center of your home, not near the window. Always accept the Software Updates on your phone. Watch those passwords. Make them difficult, the longer the better. Important steps to prevent anyone from peeking into our lives. Linsey davis, abc news, new york. When we come back here tonight, what were learning about joan rivers. 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