Might soon shoot at that getaway car and its not a bullet. Good evening, in for diane. Its great to have you on a thursday night. We begin with that scare playing out in atlanta tonight, the cdc asking how could this happen, one of their own workers making a huge and dangerous mistake, potentially exposing his coworkers to live anthrax. Heres the latest at this hour. Were learning 75 cdc employees may have been exposed, those workers being treated at this hour. Tonight theres now an investigation under way into how this happened. Abcs chief medical editor, dr. Richard besser, who spent many years at the cdc got the call today, his source in the lab telling him he was, quote, devastated. So we lead off with dr. Besser. Reporter the cdc is telling us tonight that something went terribly wrong. Live anthrax was passed along to labs that werent equipped to handle it. Between june 6th and 13th, 75 people without the needed protective gear may have breathed it and become infected. The level four bio lab at the cdc in atlanta handles the deadliest diseases and viruses in the world, from ebola to smallpox, where precautions are serious and necessary. In the level three labs, scientists and doctors work on such deadly diseases as plague and west nile, t. B. And hiv. Tonight the labs are shut down, sealed, being decontaminated. The bioterrorism Rapid Response lab is where anthrax is handled in its live form. Its there that it got into lower level labs where it may have escaped into the air. Theres no risk of these 75 workers spreading the disease to others, friends or family, because it isnt spread person to person. But theres real concern for the workers themselves. None of the workers show any symptoms yet but theyre not yet in the clear. Symptoms like fever and chills, shortness of breath, confusion, dizziness and headache. If anthrax goes untreated, it has a very high mortality rate, about 85 . Even if you get the right antibiotics for it, theres a 40 mortality rate. These workers are all being offered antibiotics for 60 days, and the vaccine just in case. For an organization that works so often with the deadliest diseases on the planet, its a frightening mistake. Dr. Besser is with us now. You made the point that its only these workers, not their families, not their neighbors. Why is that . You have to breathe it in to get sick. Rarely you can get it from contaminated clothing. I learned that the outer clothes were left in the lab. Youve been talking to your sources and they are concerned about the workers . Yeah. This is a very unusual organism. This can live in your body for 60 days and infect you and it can be deadly. Thats why 60 days of antibiotics, plus the vaccine. The bigger picture, people are going to say this is one of the most dangerous labs in the country. How does a mistake like this happen . This is one of the worlds premiere labs. I spoke with them and they are absolutely devastated. Theyre going to look to see how did this happen, and i think there are going to be some outside eyes looking at this as well. Dr. Besser tonight. I know youll have more on good morning america, thank you. We move to the crises in iraq, big developments this evening. President obama revealing military action is on the table. 300 advisors, special forces, sent into iraq. Could the americans see combat . We have Team Coverage at the white house and baghdad and we start with abcs chief global correspondent martha raddatz. Shes in iraq again for us tonight. Martha, good evening. Reporter good evening, david. Clearly what the president is trying to do is keep this nation in which the United States has invested so much from collapsing while resisting a slide back to war that he tried so hard to end. Tonight fighter jets launching from a u. S. Carrier back over the iraqi skies, watching the militants on the move. Today president obama made it clear that u. S. Combat forces will not fight a new war here, but within days, the first of some 300 additional u. S. Troops, military advisers, will begin arriving, a move clearly aimed at bolstering the iraqi forces that are crumbling in the face of battle. And the president today not ruling out air strikes. We will be prepared to take targeted and precise military action if and when we determine that the situation on the ground requires it. Reporter that likely means using drones to fire on limited targets. The president did have tough words for his iraqi counterpart, nuiri almaliki, for failing to unite iraqs religious and ethnic factions. But the president also said there are lessons to learn from this crises and from the nineyear war that has left deep scars on our nation. Whats clear from the last decade is the need for the United States to ask hard questions before we take action abroad. Martha is with us now from baghdad. Martha, we all heard the president say today that hes prepared to send those additional American Military advisers. Were talking about hundreds of them. Who are they and what would they be doing . Reporter they will actually be special forces, david. The 300 will divide into teams of 12, and they will actually embed with Iraqi Military forces, first the headquarters and then a brigade level to help train them and advise them. And the white house has not ruled out that these advisors would actually help the iraqis find targets for air strikes. No combat for these american troops, but i would still say this is a Dangerous Mission. Thank you. I want to bring in abcs chief White House CorrespondentJonathan Karl standing by. You heard martha report there, the white house not ruling out special forces would help iraqis find targets for air strikes. Martha points out it could be dangerous. Was this a surprise . Reporter it was in this sense, david. We knew the president was likely to send special forces to help train the iraqis but this is a significantly more Dangerous Mission than had been widely anticipated. Three times as many special forces as had been reported. David, they will be embedded, as you heard martha report, with iraqi forces not just in baghdad but also up in northern iraq. The president though faces a real dilemma here. On one hand, he wants no part of going back into iraq, a war he claims credit for ending, but at the same time this group now taking over parts of iraq poses a real threat. As a former ambassador to iraq who served under obama said today, this group is more formidable than bin Ladens Al Qaeda at the time of the september 11 attack. Tough choices ahead. Jon karl, martha raddatz, thanks to you both tonight. We move on here to another developing headline, a giant swath of Severe Weather from the midwest tonight to the east coast. There could be major flash flooding, the forecast in a moment. First new images of a new and massive twister. This time you can see what appears to be four funnels inside this sweeping tornado. It was terrifying for many, and Abcs Steve Osunsami with the pictures. Reporter this was the moment across the prairies of south dakota when families here knew they had to run for cover. Another set of twin tornadoes were moving into wessington springs. When it hit 15 miles east, you can see four smaller whirlwinds circling inside one of the tornadoes. These were pictures families took with their cell phones. Early reports show the winds reached 127 miles an hour damaging more than a dozen homes and destroying businesses. At the kophman farm they lost everything. It was a tearful reunion today for this large family. Hes not taking it very well. Reporter this is what the house looked like before, nearly 100 years old. It hurt to see what the tornado left. That home it was really the reporter the Severe Weather stretched east, the lightning setting homes on fire in minnesota, the high winds bringing down trees over homes in ohio and the nations capital. In chicago, 1,400 passengers stranded by the weather had to sleep at ohare airport. Weve traveled a lot. We have never had an experience like this. This is unique. Reporter here in the prairie theyre having to clean all of this up and on top of it all, theres no power. Utility crews are out trying to repair those power lines tonight. David . Steve, thank you. It could be a long time before power is back on. 14 million americans in the path of Severe Weather tonight. Look at the heavy rain and flash floods washing out towns across the midwest. In minnesota, scenes like this one. Drivers plowing through deep waters there on the roads. I want to bring in our chief meteorologist from philadelphias top station. I know you were dealing with Severe Weather over the last 24 hours, but now youre watching another part of the country tonight. What are you seeing . Thats right, david. The focus of Severe Weather across three areas tonight. The strong storms that moved through philadelphia have shifted to the south, including roanoke and raleigh. The upper midwest under the gun from minneapolis to kansas city and another area over northern texas. Were looking at the potential for large hail, damaging winds and flash flooding a big concern. David, i want to show you the area of flooding. Its a very broad area. Theres a stationary front thats draped across the upper midwest into the midatlantic. Along this front were looking at the potential three to four inches of rain, could cause flash flooding. Minneapolis already dealing with record rainfall. Well be watching for that. Thank you. We turn our attention to brazil now and to the world cup. Team usa playing this weekend. A giant headline tonight, perhaps the toughest player were going to face on sunday is tonight hurting. His name is Cristiano Ronaldo, portugals best known weapon nursing a knee injury. Its making global headlines because hes also known for his moves off the field. Abcs paula faris called in with this one and shes in rio again tonight. Reporter he is soccers reigning player of the year. Cristiano ronaldo from portugal reporter on the field a scoring machine. Hes done it again this is astonishing reporter off the field, an international sensation. An advertisers dream. A sex symbol. Making more than lebron james. And tonight he is the biggest obstacle standing in team usas way. Thats why the world is abuzz about ronaldos knee injury. Seen with ice packs, missing practice. How effective will he be against the americans this sunday . Advantage team usa . Definitely Advantage Team usa. Portugal without Cristiano Ronaldo is a totally different team. Reporter the americans have injury issues of their own. Their star, jozy altidore, is out. But the other challenge, the game will be played in manaus, the middle of the amazon, hot humid for players and diehard american fans. With hotels scarce, theyre sleeping at a camp in the jungle just to see the action. I wanted a boat ride on the amazon river. Ten minutes by bus down to a marina and then to an outrigger canoe. 20 minutes into the juggle, no lights, no air conditioning. What are you going to tell the americans who are going to manaus this weekend . Good luck. Bring bug spray and air conditioners. Reporter now, we came inside because its been pouring all day in rio. Its just 50 degrees where the team is training and manaus, so hot and humid players concerning about breathing and cramping during the game. It will be their toughest conditions yet. Very concerned about Cristiano Ronaldo tonight, paula. Thanks for your reporting from rio again tonight. You can always watch the world cup action on our cable partner, espn. Team usa this weekend. Weve all seen Police Chases but tonight the video asking how far is too far. This evening abc news ryan smith with the dangerous moments on the golf course and the new tool that might help prevent it. Reporter its the last kind of driver you expect to see on a golf course. Police cars barreling down the fairway, sirens blaring. There was people running. I could see in the distance people scattering and running all over the place. Reporter minnesota cops chasing this man on outstanding drug warrants. Today the department is reviewing whether that chase crossed the line. Their policy on vehicle pursuits requires officers to, quote, exhibit a high degree of common sense. High speed Police Chases now happening all too often, some turning deadly. More than 300 People Killed in just one year. Including innocent bystanders, like john ferriss son paul. Ferris now crusading against those chases. The burden to protect the public is on law enforcement. Oftentimes protecting the public means breaking off and not continuing that pursuit. Reporter so where do police draw the line . Police officers dont want to be in chases . Police officers dont want to be in Police Chases. Its a danger to them and to the public as well. Reporter nearly two dozen Police Departments now using new Gps Technology called star chase. It shoots a tracker from the front grille of a police car onto the car theyre pursuing. They can trace the suspect without the hot pursuit. Some hope this will make the chase, as exciting as it may seem, a thing of the past. Ryan smith, abc news, new jersey. Ryan smith, our thanks to you. And the powerful moment to share with you tonight, president obama awarding the medal of honor today, the nations highest award for valor, to marine Corporal Kyle carpenter who threw himself onto a grenade while serving in afghanistan to save his friend and his fellow marine as they were under attack by the taliban. His bravery cost him his right eye. Hes only the 8th living recipient of the medal of honor for service in iraq and afghanistan. Still much more ahead tonight on world news. If youve ever bought a Lottery Ticket, is the store owner telling you the truth when youre told you didnt win . What to watch for, the eyeopening report just ahead here. So many of us doing Spring Cleaning this time of year, but does your Spring Cleaning look like this . Tonight what it takes to spruce up the skywalk at the grand canyon. You got to see this coming up. Ye and thank you for your bravery. Thank you colonel. Thank you daddy. 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Reporter tonight the Florida Lottery looking for payback, arresting four, including these two women here in south florida in just the past 48 hours, part of a sweeping investigation of nearly 100 florida retailers for possible lottery fraud. That after discovering that of the top ten winners of scratchoff games in the tampa bay area, nine were Convenience Store owners. Retailers like this man who have won dozens of jackpots, including six in a single day. He has not been charged with a crime. And others. Youve won 38 times for about 50,000 . In four years maybe. How much money have you put into it, do you think . Maybe 60 or 70 . Reporter Florida Lottery zipped out a batch of psas. The next time you play we encourage you to sign your ticket immediately upon purchase. Reporter encouraging people to sign their tickets so no one else can claim them. Experts say some clerks may be playing the odds, but others around the country, from california to new york, have been caught playing their customers, like this clerk in syracuse, new york convicted of swindling a customer, telling him he had a 5,000 ticket when it was really worth 5 million. Or this clerk in long island, new york who told the customer his Winning Ticket was only worth 1,000 when it was actually worth a cool million. If you have a Winning Ticket, you dont have to give it to the clerk. Thats what these scanning machines are for. Place it right there, wait a couple seconds and this machine will tell you whether youve won or in my case, not. While some clerks may lie, the computer doesnt. Matt gutman, abc new