tonight on "world news," armed an dangerous. a gunman opens fire at the office of a powerful conservative group. he was stopped by a heroic security guard in the nick of time. was it domestic terrorism? out of the shadows. countless young imgraments step forward to cede their right, starting today, to live and work here legally. buckle up. nail-biting storms, bumpy rides. our reporter tests a new technology that promises you a smoother ride. and, power ball mania. more than $300 million and a dream. tonight, how to take your best shot at hitting pay dirt.

good evening. as we come on the air, new details are pouring in about that dramatic shooting in washington, d.c. today. a gunman, walking into the lobby of a powerful conservative organization, the family research council, and shouting something mysterious and pulling out a weapon and firing it. he wounded a security guard who still, somehow, managed to wrestle the shooter to the ground, saving untold lives. abc's senior justice correspondent pierre thomas has the latest at this hour. >> reporter: this is the man police suspect was about to begin a shooting spree at one of the nation's best known conservative groups on family issues. a potential disaster may have been averted because of the work of this security guard, videotaped by abc washington affiliate wjla, as he was being transported from the site after being short. >> the security guard is a hero as far as i'm concerned. >> reporter: police say at

010:45 this morning, the suspect walked into the lobby of the family research council and was confronted by a security guard as the suspect yelled something suggesting he did not agree with the council's policies. sources tell abc news the man pulled out a .9 millimeter handgun, firing a shot and wounding the guard before he was wrestled to the ground. sources have adent if ied this man as the suspect. so far, his motives are unclear. >> nothing about him or his circumstances to be able to determine his connection to this group. >> reporter: but police have not ruled out the possibility the incident was politically motivated, ginn the suspect's alleged rant and the family research council, which promotes conservative positions on hot button issues like abortion and gay rights. authorities were taking no chances and could be seen sweeping the area for explosives following the arrest. sources say the suspect had material from fat food giant chick-fil-a, but it was unclear

whether the incident has any connection to the recent controversy over gay marriage. the owner recently set off a political firestorm saying he opposed gay marriage. republican presidential candidate mitt romney said in a statement, "there's no place for such violence in our society." he also said he was praying for the family research council after the day's horrific events. >> and pierre, i keep thinking of that security guard, managing to save lives though he was wounded. how is he tonight? >> reporter: he's in stable candidate, diane. recoverers from a gunshot wound to the arm. the remarkable thing is that he helped subdue the suspect, even after being shot. a real hero, diane. >> reflexes were incredible. thank you so much, pierre. and now, we head out west, those wildfires are still raging, though, tonight, the wi firefighters are holding the flames at bay. the flames cover an area the side of rhode island. some of the hundreds and hundreds of people who have e vac waited are trying to go back for the medicines they need.

and abc's neal karlinsky has their stories now. >> reporter: on sunlight drive today at the edge of the fire, the desperate came to plead their case with police. >> i need to get my meldds. >> reporter: they've been evacuate and may lose their home. right now, they are just worried about making it through the night without critical medications. how urgent is it for you all to get your medication? >> very urgent. >> reporter: even with improving conditions, the fire remains potentially explosive with 28,000 acres burned and roughly 70 homes destroyed. this valley, there was nothing here a short time ago. now it is filled with smoke, even though you can't see the flames, it's clear it's now beginning to ignite in here again. >> moving the horses out. >> reporter: home video shows horses that fled the fire being rounded up and walked down a road to safety. meanwhile, a nearby fairground has become an orphanage for displaced animals. 419 of them, and counting. >> eight pigs, 35 alpacas, two

llamas and 41 goats. >> reporter: paula says she's more worried about her animals than her house. >> there are babies, i mean, we worked really hard. everything that we've worked for is this. >> reporter: but on sunlight drive, the dels pratt waiting game has no end in sight. >> three days. >> i know, i know. >> it keeps getting worse, not better. >> reporter: and firefighters are worried about a forecast for extreme heat tomorrow, setting them back all over again. neal karlinsky, abc news, cle elum, washington. >> reporter: and we turn now to new alarm from the cdc about an outbreak of the west nile virus. more widespread than they have ever seen before. the virus has now been detected in 43 states. it is carried by mosquitos. so, what is the first sign that you're in trouble? here's abc's ryan owens from dallas, where they have declared a state of emergency tonight. >> it feels like somebody had

lodged an axe in my brain. >> reporter: if you think west nile virus only affects the elderly and unhealthy, meet kathryn deville. she's 42, mother of an 8-year-old, and in good health. at least she was until a mosquito bit her last month in her backyard outside dallas. >> just about the time i think i'm out of the woods, something else comes along and we have to fight that, too. >> reporter: you have felt mess rabl for more than two weeks. >> i have. >> reporter: that one mosquito bite left her first with a fever of 104 and now with meningitis and encephalitis. dallas is the epicenter of this epidemic. one quarter of the country's cases are in this wound county. most people with the virus never know they have. roughly 80% have no symptoms. 20% suffer from combination of high fever, headaches, joint pains, vomiting and diarrhea. only about 1% develop the neuro invasive form of the disease that attacks the brain and

spinal cord and can be fatal. >> we are starting to see younger patients get neuro invasive disease and that's unusual. >> reporter: communities across texas have been spraying pesticides every night. and by the end of the week some will start controversial aerial spraying. >> i don't want anyone to get this. so if that means they have to spray from the air fo it. >> reporter: doctors say kathryn will recover but she's already missed her daughter's first day of school, after a summer few here will forget. ryan owens, abc news, dallas. >> i want to bring in abc's medical editor, dr. richard besser, spent most of his career tracking diseases with the cdc. so, 400 people have already had the most severe consequences. what are we going to do about this? >> reporter: it's very serious. and there is no treatment. so, the key here is really all about prevention. and when you talk about prevention, the key is, fight the bite. if you don't get bit by a mosquito, you're not going to get this disease. the woman that we saw in this story, it doesn't always go

away. 60% of people continue to have those neurological similarympto five years. >> and where does it come from? >> reporter: well, mosquitos get it from birds. it is people who are over 50, healthy and active, they are outside, who are most likely to get the most severe kind of west nile virus. >> very high fever and aches? >> reporter: aches -- it will seem like you have the flu. and if you've got the flu and it's in an area where there is west nile circulating, it could be this disease. >> all right, thank you, dr. richard besser. next, now, your voice, your vote, and a new face out on the campaign trail, the president's team calls her its secret weapon. michelle obama. and abc's david muir has more tonight. david? >> reporter: hey there, diane. great to see you from the battleground state of ohio. here, mitt romney's running mate is set to be the headliner. but this evening for president obama, it was his other running

mate stealing the show. >> reporter: it was the first time the first lady joined her husband in iowa this campaign -- a state president obama won four years ago, and a state they're determined to hold on to. >> your president knows what it means when a family struggles. this is not a hypothetical situation for him. he knows what it means to want something better for your kids and your grandkids. >> reporter: the first lady also telling the crowd she was aware of where her husband had been and what he'd be eating here at the iowa state fair. >> did you have a fried twinkie? >> pork chop and beer. >> he's so pleased with himself. >> reporter: meantime, tonight, with mitt romney headed to a fund-raiser in north carolina, it is paul ryan here in ohio. and while rinl might be the running mate, it's his record driving much of the debate right now. ryan's budget, with deep cuts he argues are needed, and big changes to medicare, eventually adding like a voucher-like

system for seniors to shop for their own health care. but when pressed for specifics, ryan, trying to make it clear who is on top of the ticket. >> you -- how much? >> the point -- i joined the romney ticket. >> reporter: but ryan isn't the only one being asked about his record. romney was asked today, are you running on your budget or paul ryan's? >> i'm tone running for president. >> can you tell us how your budget is difrment? >> we're very much on the same page. >> reporter: tonight, the battleground of ohio, where today, "world news" wanted to hear your voice. talking to ohio voters, paul ryan riling some here, reinvigorating others. >> the voucher thing that he's talking about, i don't understand it. >> i like to see paul ryan and barack obama debate and leave romney and biden to duke it out after that. i feel like they both are in a different class. >> reporter: they're going to love hearing that. to be honest with you, the romney campaign probably wouldn't mind hearing that tonight.

they are reveling in the swelling crowds for paul ryan, the star pow earl he's helped bring to this ticket. but the star power in iowa today, michelle obama. the first lady hoping to help her husband carry that state again in november. diane? >> from the campaign trail, david muir once again tonight. thank you, david. 83 days now until americans head to thele tos. a big legal decision today about producing a voter i.d. at the polling place. today, a judge in pennsylvania approved a republican-sponsored law requiring residents of pennsylvania to show photo i.d., if they want to vote. the ruling is expected to be appealed by democratic critics, who say the law makes it harder for poor and young people to vote. and all day long, images like these poured into our news room. tens of thousands of undocumented young immigrants coming out of the shadows. this is the day the president's new initiative begins to take hold, giving them a chance at the legal right to work and live openly in this country and abc's

david wright was there, as the lines stretched into the distance. >> reporter: they have been hiding in plain sight. neighbors, classmates and workers with no legal right to be here. today, some of the youngest members of this community began stepping out of the shadows. among them, sophia campos, born in purr rue. >> i have been here since i was 6 years old. i am an american in every sense of the word. except for that nine digit social security number. >> reporter: without that number, she couldn't apply for financial aid. that's how she first learned about her immigration status. her parents had been too ashamed to tell her. >> as undocumented members of this community, we are often living in the shadows every day because of shame, because of fear of deportation. >> reporter: for sew tia, that changes today. a new initiative from the obama administration will grant temporary work per milts and remove the threat of deportation for young people who qualify. you have to be under 31 and have arrived here by age 16.

you have to be in school, graduated or served in the military. and no criminal record. of the estimated 11 million undocumented immigrants, as many as 1.5 million may qualify. >> my name is adrian reyna. i'm from mexico. >> my dream is to open a community center. >> reporter: they now have a chance to seize the american dream. >> my dream is to be an urban planner. >> reporter: in chicago, and houston, and l.a., the lines have been growing all day. the new program has many critics, who call it an end-run around congress. >> it is no coincidence that this sweeping policy change was denounced less than five months less than five months before a presidential election. >> reporter: but for see foe ya campos, it's a gond send. she graduated with honors from ucla. now, she hopes to go to m.i.t. for grand school. this is going to be as important as yourdy mroep ma. >> more. up to this point, we hang ourdy mroep ma, you know, in our rooms and we say, "what now?"

>> reporter: now, she can put her education to use. david wright, abc news, los angeles. and there were other long lines out there today, of a very different kind, stretching all the way to the horizon. we were struck by these images, theme lining up for the powerball jackpot, which has now reached $323 million, the forth-largest jackpot in history. we were wondering, what are your real chances of winning and what can you do to increase the odds of cashing? we put our experts on it and we have the answers later in this program. but next, and coming up here, lightning, hail, severe turbulence? we fly into the storm to test a new idea to put an end to those bumpy nightmare flights. [ male announcer ] this is rudy. his morning starts with arthritis pain.

and two pills. afternoon's overhaul starts with more pain. more pills. triple checking hydraulics. the evening brings more pain. so, back to more pills. almost done, when... hang on. stan's doctor recommended aleve. it can keep pain away all day with fewer pills than tylenol. this is rudy. who switched to aleve. and two pills for a day free of pain. ♪ and get the all day pain relief of aleve in liquid gels. ♪ hey america, even though slisa rinna is wearing the new depend silhouette briefs for charity to prove how great the fit is even under a fantastic dress. the best protection now looks, fits and feels just like underwear. we invite you to get a free sample and try one on too. there's the sign to the bullpen. here he comes. you wouldn't want your doctor doing your job, the pitch! whoa! so why are you doing his? only your doctor can determine if your persistent heartburn is actually something more serious like acid reflux disease. over time, stomach acid c damage the lining of your esophagus. for many, prescription nexium not only provides

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it's a nightmare for air travelers. rough weather turning your trip into a roller coaster ride at 30,000 feet. but tonight, help is on the way. a new technology allowing more pilots to avoid the teeth-clenching turbulence. abc's jim avila went on a wild ride to see how it works. >> reporter: it happens more than 70,000 times a year. pilot reported moderate to severe turbulence, unstable air,

caused by colliding winds and temperature change. three-quarters of all weather-related accidents caused bid rough air, shaking up the cockpit and cabin. >> i saw at least two people hit the ceiling. >> reporter: this is why the flight attendants are always pestering you to keep your seat belts on. in-flight turn against causes more injuries in the air than anything else and airlines don't like it either. it's expensive, costing them hundreds of thousands of dollars per incident. our wild ride has just begun. i think we got one. think i'll sit down. rough weather rarely brings a plane down, but it does cause a dozen serious injuries and a half billion dollars in damage and delays a year. this turn against animation shows how the unbelted can achieve weightlessness. now, a breakthrough. for the first time, a new 3d radar installed in business and soon fleets of commercial jets. southwest already has it in 19 planes. it will allow pilots to

spotlightening, hail and the bumps f from more than 60 miles away. >> what it gives me is the information to make a better decision sooner. >> reporter: honeywell, the makers of the new radar, intentionally flew us into rough weather over north carolina. >> we are directly facing this. i know that there is hail, there's lightning. >> reporter: clouds billowing, cabin shaking, to demonstrate the new radar screen that actually identified lightning cells and hail, flashing bright icons pilots cannot miss. >> it allows me to concentrate on decides where to go, to have the smoothest, safest ride. >> reporter: and while lightning may frighten passengers most, a hailstorm is what really causes the damage. look at this jet nose cone. >> it can tear right through it. >> reporter: best to avoid that. here's to smoother flights. i'm going to sit down. jim avila, abc news over wilmington, north carolina. and coming up, look closely. what do you think? has the loch ness monster

finally been caught on camera? one man says the long quest is finally been caught on camera? one man says the long quest is over. been fortunate to winon g. but when joint pain and stiffness from psoriatic arthritis hit, even the smallest things became difficult. i finally understood what serious joint pain is like. i talked to my rheumatologist and he prescribed enbrel. enbrel can help relieve pain, stiffness, and stop joint damage. because enbrel, etanercept, suppresses your immune system, it may lower your ability to fight infections. serious, sometimes fatal events including infections, tuberculosis, lymphoma, other cancers, and nervous system and blood disorders have occurred. before starting enbrel, your doctor should test you for tuberculosis and discuss whether you've been to a region where certain fungal infections are common. don't start enbrel if you have an infection like the flu. tell your doctor if you're prone to infections, have cuts or sores, have had hepatitis b, have been treated for heart failure, or if, while on enbrel, you experience persistent fever, bruising, bleeding, or paleness. [ phil ] get back to the things that matter most. ask your rheumatologist if enbrel is right for you. [ doctor ] enbrel, the number one biolog medicine

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and, before the break, we asked you to look closely at this picture. it was snapped by a sailor in scotland, looking for proof of the famed monster. and he said, here's what he saw. deep gray. it swam slowly. after ten minutes, dived under the water and did not resurface. the legend of loch ness has endured since 565 a.d. so, did he capture the shot of the century? tell us what you think at abcnews.com. and, coming up right here, that $320 million jackpot. but which of these givens you the best chance of a big win? the slot machine, a scratch card or the lottery? the answer, when we come back. people with a machine.

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bit. i would be very generous to everybody. >> reporter: so, does the excitement -- >> spread it around to the rest of the family. >> probably give some money to the church and then i'll just start spending money. >> next in line please! >> reporter: it is dreams like that that have people gobbling up tickets in one state at a rate of more than 7,000 a minute. but if you really want to get the best return on your investment, so to speak, there are a lot of safer gambles. the olds of hitting all six winning powerball numbers, roughly 172 million to 1. the better belt? playing one of those instant scratchoff tickets. you do have a much better chance of winning something. and researchers found the best bet is a slat ot machine at a casino. the one-armed bandit actually kicks back more money per dollar weighered than either scratch tickets or lotteries. >> in lots of different ways, clearly, the ka see knows give you much better odds than the

state lotteries ever do. >> reporter: so, for all of you practical gamblers, be warned. lotteries aren't your best bet. >> listen, i don't think i'm going to win, but i'm giving it a shot. >> reporter: but then, what's the fun in being a practice can gambler? ron claiborne, abc news, new york. >> and thank you so much for watching. we're always here at abcnews.com, and, of course, "nightline" will be along later. we'll all see you back here tomorrow night. until then, have a great evening.