Dozen groups of special t. S. A. Agents are fanning out at major transportation hubs, and counterterrorism teams have several individual suspects under surveillance. The government has already issued a warning of an increased terror threat, and for a time today, there was fear that it was happening at the scene of a 2013 massacre the Washington Navy yard. Heres jeff pegues. Reporter the allhandsondeck response at the navy yard was an example of the heightened concern about terrorist attacks. It was a false alarm but Law Enforcement is not taking any chances ahead of the Holiday Weekend. Metropolitan police chief cathy lanier we take every event here in washington very serious and our posture remains extremely high for all special fortunates and it will continue for the fourth. Reporter last weeks department of Homeland Security bulletin warned of an increased threat of isisinspired violence over july four. One official said, there is no specific credible intelligence for an attack but isis has called for attacks against the military, Law Enforcement, the u. S. Government, and the american public. Thats led to beefed up security at airports and landmarks. New york will have an extra 7,000 Police Patrolling july 4 events and Fusion Centers very set up to help coordinate information in the event of an attack. In recent weeks, investigators have stepped up arrests taking more than a dozen alleged isis sympathizers into custody including several people in the new york area. In one case, prosecutors say a 20yearold College Student had researched Pressure Cooker bombs and had been stopped by police twice at the George Washington bridge. John miller is Deputy Commissioner of intelligence and counterterrorism for the new York City Police department. I think what youve seen across the country is 50 cases involving isis sympathizers, wouldbe recruits or people who were already operating on behalf of isis being caught in the net of the u. S. Intelligence community and Law Enforcement and stopped. Reporter in addition to the 4th of july, isis has called for attacks during the muslim holy month of ramadan. Scott, Law Enforcement officials worry that a loan wolf radicalizeed by isis propaganda could slip through the cracks. Pelley jeff pegues in the washington newsroom, jeff, thank you. A toxic fire is smold nerg tennessee from a tanker car that derailed late yesterday. Omar villafranca is at the scene in maryville. Reporter the train travel swg 57 cars, derailed and one car caught fire just before midnight. Reporter the derailed car was carrying add conclude, a Hazardous Material used in the making of plastics. Marian obriant is with the blunt county sheriffs department. We learned pretty quickly that there was a highly flammable and toxic substance on the car that derailed. The fire and the way the wind of blow that we had to get people out of there. Reporter exposure to the fumes can cause headation headation dizziness and rapid heartbeat. Plumes of noxious smokes crept into nearby maryville. Crews raced to evacuate 5,000 residents in the middle of the night. Manuel toledo woke up to a man pounding on his door. He had this, like, cover on it. It looked like you know, like he was in an e. T. Movie or something. He just this had big thing on his face with oxygen connected to it. So it was yeah, it was pretty scary. It freaked us out. Sir can i help you . Reporter the company who owns the train c. S. X. , s an Outreach Center for displaced residents at a local high school. Officials believe it will be at least one more night before they can return home. 25 people were admitted to the hospital, including 10 First Responders who didnt whan kind of chemical they were dealing with. Scott, if the air quality does not improve residents might have to spend the Holiday Weekend here at the shelter. Schieffer omark thanks very much. Oil, chemicals and other goes are shipped across the country on a network of 140,000 miles of track. This year, freight railroads are expected to spend a record 29 billion upgrading rails and purchasing locomotives and cars. Kris van cleave now on why those improvements are so important. Reporter in the first four months of 2015 there, have been seven train derailments releasing Hazardous Materials. Its happened at least 58 times since 2012. But overall the federal Railroad Administration says freight derailments are down nearly 47 since 2005. The challenge in Railroad Safety is that theres no one cause that you can attack. Reporter dr. Allan zarembski teaches train safety at the university of delaware. We tend to look at where are the larger concentrations of derailments and what the technology is going to help to try to find a derailment causes before they actually result in a derailment. Reporter there is concern. The sometimes onemilelong oil trains hauling volatile crude from north dakotas oil fields. The amount of crude transported by rail has jumped 4,000 since 2008. At least five times this year, oil trains have deraild and caught fire. National Transportation SafetyBoard ChairmanChristopher Hart has expressed concerns about the tank cars used to carry crude. Unfortunately, were using the same cars to move crude oil as to use corn oil. That is not acceptable. The percentage is amaze allege lg low 99. 99 of cars get across our Network Without an accident. Edward hamberger says the industrys Safety Record is sound. We wont be satisfied until we can get it to 100 safety, but right now were at 99. 995. Reporter the department of transportation has issued new stronger guidelines for rail cars that hall crude but it will be up to five years before all of the trains on the tracks are compliant. Scott, railroads are required to install new Safety Technology aimed at stopping derailments by the end of the year. Pelley our transportation correspondent kris van cleave. Kris, thank you. Today, the British Oil Company b. P. Agreed to pay the largest corporate settlement in history over the 2010 disaster in the gulf of mexico. 18. 7 billion will finally settle all the claims by the federal government, five states, and hundred of local governments. 11 people were killed when a drilling rig leased by b. P. Exploded. Mark strassman covered it then and has our report tonight. People jumped into water. Reporter the oil leak forward 87 days, the worst offshore spill in u. S. History. B. P. Was later found to be grossly negligent for the explosion aborldz the deep water horizon platform and today it agreed to a settlement that will include a 5. 5 billion fine for violationing of the clean water act, 7. 1 billion to the u. S. Government, and five states to repair coastlines smeared by oil. 4. 9 billion to settle economic claims by those five states. And up to 1 billion to 400 local governments. Louisiana, the most heavily damaged, gets almost 7 billion the biggest share. Attorney general Tommy Caldwell louisiana gets what we need, which is Coastal Restoration and commensurate compensation. Reporter in june of 2010, we were covering waves of oil coming ashore. It was clear b. P. Had no ready fix. All this oil, this is so heavy i can barely lift it. B. P. Finally capped the well three months after the leak began, but 134 million gallons of oil had leak into the gulf. In a Statement Today b. P. Said, we have made significant exprg with this agreement we provide a path to closure for b. P. And the gulf. B. P. Has 18 years to pate settlement, and most of it is tax deductible. All told, scott this is costing b. P. At least 45 billion in cleanup costs fines and settlements. A federal judge still has to approve, and that could take three months. Pelley Mark Strassman thanks very much mark. Today, the Unemployment Rate fell to 5. 3 , the lowest in seven years. But its a mixed picture. The Labor Department says 223,000 jobs were created in june, fairly healthy. But hourly wages were flat. And Anthony Mason reports the Unemployment Rate fell for the wrong reason. Reporter the Unemployment Rate dropped in june but only because more people dropped out of the workforce. The socalled Labor Force Participation rate is now at its worst level since 1977. 34yearold Katherine Zaleski is trying to change that. Shes president of power to fly a new hiring web site for women who want to work remotely from home. How are the enterviews going today . Reporter zaleski and her cofounder, milena berry, have no office space. Its very much a brand built around placing more women on jobs. Reporter they and their 35 employees all work remotely themselves. The percentage of women in the workforce is going down in the u. S. Because were telling women they need to be in the office all the time and thats clearly not work. Reporter in 2000, nearly 59 of women 20 and older were employed, an alltime high. But since then, that ratio has fallen back to 55 . A lot of women i know, they disappear in their 30s because they physically cannot be in an office. Reporter nearly 1,000 companies have posted job listings on power to fly including heft, buzzfeed, and the washington post. For positions positions and in technology, marxing, sales, and customer service. And the web site is growing so quickly, power to fly itself plans to hire another 60 workers over the next six months. Its this idea that you can continue to be just as productive just as valuable as a team member but you can do it remotely. Reporter its not just women who have been withdrawing from the job market. Only 71 of men have now participating in the labor force, and scott thats an alltime low. Pelley anthony, we saw yet again in the jobs data today that wages are flat. Reporter basically 2 over the last year, scott. Thats barely above the rate of inflation. Economists keep saying we think this is going to happen, wages are going to start to grow, but they havent. Basically, employers wont race raze wages until they have to get the workers they need which suggests theres still slackness in the labor market. Pelley Anthony Mason thank you anthony. A dump Trump Movement expanded today as Companies Fired the new York Real Estate tycoon and republican president ial candidate. What he said at the start of his campaign is costing him business, but its paying in the polls. Heres nancy cordes. Reporter if youve had your eye on a trump suit or trump Home Collection bed youd better by buythem now. Macys and serta are following nbc and univisions leave severing ties with the billionaire. In a statement serta said it does not agree with nor endorse the recent statements made by mr. Trump about mexican immigrants. Theyre bringing drugs theyre bringing crime theyre rapists. Reporter trump was unrepentant in a cnn interview. Something is doing the raeping, don. Something is doing you think its just women raeped . Who is doing the raping. Reporter his poll numbers are on the rise. Recent surveys of Republican Voters show trump has gone from an alsoran to second place in iowa, new hampshire, and nationwide which has not gone unnoticed by democrats. There seems to be some of the hateful rhetoric hes spewing actually has an audience. Republicans told the country they had learned from the last camcampaign that we need a more inclusive society, we need to be welcome will. This send the opposite message. Reporter and g. O. P. Candidates know it. It was former Texas Governor rick perry today. I dont think Donald Trumps remarks reflect the republican party. Reporter new Jersey Governor Chris Christie took trump on, too. There have been certain elements of our matter have been unfriendlily to elements of our population, including the latino community, and we need to change that. Reporter trumps republican opponents were initially reluctant to weigh in, worried he would turn that sharp tongue on them. Clearly, scott they decide staying silent carries the own risks. Pelley nancy, thank you very much. And today Hillary Clinton got a new challenger for the democratic nomination, former virginia senator jim webb said hes in. The Holiday Weekend begins with concerns about a wave of shark attacks. 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Pelley theres been another shark attack in north carolina, thats 11 attacks since midmay, five in the past week. Vicente arenas is looking into why. Reporter Andrew Costello suffered wounds to his rib cage, lower leg, and hip in the shark attack on wednesday, he was waist keep, about 30 feet off shore when the shark pulled him under. Costell oh, the 67yearold former editor of the boston hearld, was airlifted to a hospital where he is listed as being in good condition. The recent spate of shark attacks has left many beachgoers nervous. The carolinas is not particularly a place where would would expect reporter dr. Samuel gruber is the director of the bimini sharklab in the bahamass. I think something triangle is going on because the trend is normally zero or one attacks in that area in any one year. Reporter theories as to why this is happening range from time of day to bait fishing sea turtle migration, lunar cycles and global warming. Gruber says there is more than 500 ciens of sharks inhabiting every Marine Environment and fresh water too. There are some sharks that are highly coastal that will swim right up on the beach. Theyll even chase fish out on to the beach out of the water to get the fish. Reporter the data we do have is based on human not shark behavior. But the real question you have to ask yourself is where do people swim in people swim in warm waters like florida, and so you have more people in the water with more sharks, youre likely to get more shark attacks. Reporter the Florida Museum of Natural Science says your chance of being bitten by a shark are one in 11. 5 million. Still, the National Park serves has sent out a shark warning. Scott, it tells people to stay close to the shore and in small groups. Pelley dreams of a championship end in tears when we come back. Insurance company understands the life behind it. Those who have served our nation have earned the very best service in return. Usaa. 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And visit our website to learn how you bemay able to get every month free. Pelley two girls were trapped as their virginia apartment burned oned it, so they jumped. First, a 17yearold and then her younger sister fell into the arms of people from the street. Both girls are okay, but 29 people lost their homes in the fire. Theres heartbreak in england after the loss to campaign in the womens world cup. The game was tired when Laura Bassett blocked a pass and kicked the ball into her own goal scoring for japan. It was devastating. That put japan in the championship though, against u. S. A. On sunday. This story is brought to you by the letter g, for goodbye. Sonia manzano of sesame street is retiring after 44 years. She wrote for the show and won 15 emmys. Her character, maria was married to luis, and they ran the fixit shop. Oh, look, hoony the spanish word for happy feliz. Hey thats just how i feel new, feliz. Me, too. Pelley she may return for the streets 50th anniversary and that will be aokay with fans. Kermit the frog said its not easy being green and that brings us to the National Debate over guacamole. Well dip into that next. Roundup roundup has a sharpshootin wand just point and shoot, and weeds are gone round fences, trees even mulched beds cause the only good weed is a weed thats dead roundup [ male announcer ] with a onetouch wand. [ whip cracks ] song Rachel Platten fight song two million, four hundred thirtyfour thousand three hundred eleven people in this city. And only one me. Ill take those odds. Be unstoppable. The allnew 2015 ford edge. [music] defiance is in our bones. New citracal pearls. Delicious berries and cream. Soft, chewable, calcium plus vitamin d. Only from citracal. When the moments spontaneous, why pause to take a pill . Or stop to find a bathroom . Cialis for daily use is approved to treat both erectile dysfunction and the urinary symptoms of bph, like needing to go frequently, day or night. Tell your doctor about all your medical conditions and medicines, and ask if your heart is healthy enough for sex. Do not take cialis if you take nitrates for chest pain as it may cause an unsafe drop in Blood Pressure. Do not drink alcohol in excess. Side effects may include headache, upset stomach, delayed backache or muscle ache. To avoid longterm injury, get medical help right away for an erection lasting more than four hours. If you have any sudden decrease or loss in hearing or vision or any symptoms of an allergic reaction stop taking cialis and get medical help right away. Ask your doctor about cialis for daily use and a free 30tablet trial. Pelley we end tonight with war and peas a battle over the recipe for guacamole. The commander in chief got right in the middle of it, and heres vladimir duthiers. Heres our guacamole. Here we go reporter when New York Times food columnistist Melissa Clark posted a recipe for a kind of newwave exwaum, one that includes fresh peas. Theres room for regular guacamole. We should try new things. Reporter within hours of posting it, the internet ghot all worked up, most antipea. Cancel my subscription said one. There are pea haters out there. I happen to be one of them. I dont like peas. It turns out neither does first foodie barack obama who offered up this tweak. Mr. Obama is something of a guacamole afficianado. Good chips and guacamole he loses it. I lose i lose my mind. Reporter there is bipartisan agreement. 2016 republican president ial candidate jeb bush tweeted categorically, dont put peas in guacamole. He was backed up by his texas g. O. P. Posse saying the New York Times declared war on texas had they suggested adding green peas to guacamole. In a country where people are divided, you could unite red state, blue states. All across the aisle. Loif that. I think thats fantastic. Im sorry theyre all hating on peas, but i think its so great. Reporter even the peas, andulentis lobby oh, yes there is one sided with tradition tweeting, looks like were getting closer to work peace. Obama and jeb bush agree peas out of guacamole. We went to try it at abc cocina in new york city. Its very zesty. Im im very proud of you. Reporter all shes saying is give peas, a chance. Vladimir duthiers, cbs news, new york. Pelley thats the cbs evening news for tonight. For all of us at cbs news, all i think enough precautions were taken. Im glad nothing happened. Reassuring but also not reassuring. There was no shooting at the navy yard and this likely was not a hoax, but todays scene full of cop cars prompted flashbacks to 2013. Thank you for joining us. Im less less. And im leslie. A call that an active shooter might have been where a gunman killed people years ago