Liberty terrorism. Weve learned that more than a 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. Es reporter the allhandson deck response at the navy yard was an example of the heightened concern about terrorist attacks. Reporter 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 events and it will continue for the fourth. Ov reporter last weeks department of Homeland Security bulletin warned of an increased threat of isisinspired violence over july four. One official said but noted bu but noted 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. Set up to help coordinate 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. Cu in recent weeks, investigators have stepped up arrests, takingud 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,dy wouldbe recruits or people who were already operating on behalfllig of isis being caught in the net of the u. S. Intelligence community and Law Enforcement and stopped. Reporter in addition to the f 4th of july, isis has called for attacks during the muslim holy month of ramadan. Ff scott, Law Enforcement officials worry that a lone wolf radicalized by isis propaganda could slip through the cracks. Pelley jeff pegues in the washington newsroom. Jeff, thank you. In another important story tonight, a toxic fire is smoldering in tennessee from a tanker car that derailed late yesterday. Omar villafranca is at the scene in maryville. Reporter the train, traveling with 57 cars derailed, and one car caught fire just before midnight. Reporter the derailed car was carrying acrylonitrile, acs Hazardous Material used in the making of plastics. De Marian Obriant is with thele 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 blowing, we knew that we had to get people out of there. Reporter exposure to the fumes can cause headaches, dizziness and rapid heartbeat. Plumes of noxious smokes crept into nearby maryville. T. Emergency 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 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. , set up an Outreach Center for displaced residents at a local high school. Il officials believe it will be at least one more night before they can return home. 25 people were admitted to the hospital, including 10 firstha responders who didnt know what 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. Pelley omar, thanks very much. Oil, chemicals and other goods 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 zarembskiwa teaches train safety at the university of delaware. We tend to look at where are the larger concentrations ofno derailments and what the technology is going to help tos try to find a derailment causes before they actually result in a derailment. Reporter there is concern. About the sometimes onemile long 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 derailed and caught fire. Er National Transportation safety Board ChairmanChristopher Hart has expressed concerns about the tank cars used to carry crude. Unfortunately, were using the same cars to move crude oil that we use to move corn oil. That is not acceptable. The percentage is amazingly low 99. 99 of cars get across our Network Without an accident. Reporter the association of american railroads 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 . I reporter the department of transportation has issued new stronger guidelines for rail cars that haul crude, but itt will be up to five years before all of the trains on the tracks are compliant. Scott, railroads are required to install new safety technologyd 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 historyer over the 2010 disaster in the o gulf of mexico. 18. 7 billion will finally settle all the claims by the federal government, five states, and hundreds of local governments. 11 people were killed when a drilling rig leased by b. P. Exploded. Mark strassmann covered it then and has our report tonight. A lot of people jumped into water. Reporter the oil leak lasted for 87 days, the worst offshore spill in u. S. History. B. P. Was later found to be grossly negligent for the explosion aboard the deep water horizon platform and today it agreed to a settlement that will include a 5. 5 billion fine forme violation of the clean water act, 7. 1 billion to the u. S. Government, and five states to repair coastlines smeared by oil. Ta 4. 9 billion to settle economic claims by those five states. And up to 1 billion to 400 local governments. M louisiana, the most heavily damaged, gets almost 7 billion, the biggest share. Attorney general Buddy 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 leaked into the gulf. In a statement today, b. P. Said reporter b. P. Has 18 years to pay the 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. , ma pelley Mark Strassmann thanks very much, mark. Today, the Unemployment Rate fell to 5. 3 , the lowest in seven years. Ictu but its a mixed picture. S the Labor Department says0 jo 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 unemploymentnly 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,om a new hiring web site for women who want to work remotely from home. How are the interviews 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 the percentage of women in the workforce is going down in the u. S. Because were telling women they need to be in the 5 office all the time and thats clearly not working. 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. Listin reporter nearly 1,000 companies have posted job listings on power to fly including hearst, buzzfeed, and the washington post. For positions and in technology, marketing, sales, and customer service. And the web site is growing so quickly, power to fly itselfin 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. Yi 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 raise wages until they have to 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 andco 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 yourbett eye on a trump suit or trump Home Collection bed, youd better buy them now. Macys and serta are following nbc and univisions lead severing ties with the billionaire. In a statement, serta said theyre bringing drugs, theyre bringing crime, theyre rapists. Reporter trump was unrepentant in a cnn interview. Somebody is doing the raping, don. I mean, you know, somebody is doing you think its just women raped . Who is doing the raping . Wo reporter his poll numbers are on the rise. R 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. Reporter maryland congressman Chris Van Hollen isllen a member of House Democratic leadership. Republicans told the country that they had learned from the last campaign that we need a more inclusive society, we need to be welcoming. This sends the opposite message. Reporter and g. O. P. Candidates know it. This was former Texas Governor rick perry today. I dont think donald trumpsre remarks reflect the republican party. Reporter new Jersey Governor Chris Christie took trump on, too. There have been certain elements of our party that have been unfriendly to elements of our population, including the latino community, and we need to change that. Reporter trumps republican opponents were initiallyy, s reluctant to weigh in, worried he would turn that sharp tongue on them. O clearly, scott, they decides that staying silent carries its 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. And surrounded by flames, there was only one way out when the cbs evening news continues. And that unlimited 2 cash back from spark means thousands of dollars each year going back into my business. Thats huge for my bottom line. Whats in your wallet . Working on my feet all day gave me pain here. In my knees. But now, i step on this machine and get my number which matches my dr. Scholls custom fit orthotic inserts. Now i get immediate relief from my foot pain. My knee pain. Find a machine at drscholls. Com when youre living with diabetes steady is exciting. Only glucerna has carbsteady clinically proven to help minimize blood sugar spikes. So you stay steady ahead. Introducing the first ever gummy multivitamin from centrum. A complete, and tasty new way to support. Your energy. Immunity. And metabolism like never before. Centrum multigummies. See gummies in a whole new light. Pelley theres been another shark attack in the carolinas. Yesterday, a man was bitten near ocracoke island. S thats 11 attacks since midmay,e five in the past week. Vicente arenas is looking into why this is happening. Reporter Andrew Costello suffered wounds to his rib cage, lower leg, and hip in the shark attack wednesday. He was waist deep, about 30 feet off shore when the sixtoseven foot shark pulled him under. Costello, the 67yearold former editor of the boston herald, 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 we would expect. S reporter dr. Samuel gruber is the director of the bimini sharklab Research Facility in the bahamas. I think something strange 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 cyclesg, and global warming. Gruber says there is more than e 500 kinds 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 . People swim in warm waters like florida, and so you have morewith 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. Nt still, the National Park service has sent out a shark warning. Scott, it tells people to stay close to the shore and in small groups. Pelley vicente, thanks. Dreams of a championship end in tears when we come back. Tears when we come back. Rance company understands the life behind it. 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Next weather talent appears at wx center with generic pinpoint filling monitor then we take special sponsored 7day graphic pelley we end tonight with war and peas, a battle over the recipe for guacamole. The commander in chief got rightir d in the middle of it, and heres vladimir duthiers. Heres our guacamole. Reporter here we go when New York Times food columnist Melissa Clark posted a recipe for a kind of newwave guacamole, one that includes fresh peas, she thought it was innocent enough. I do believe that in this world, theres room enough for pea guacamole, theres room enough for regular guacamole. I think we should embrace difference, i think we be open minded and try new things, right . Reporter within hours of posting it, the internet got all worked up, most antipea. My cancel my subscription said one. Put thousand island dressing in your milk, said another. There are pea haters out there. Who knew there were so many pea haters. Reporter i happen to be one of them. I have to admit i dont like peas. It turns out neither does first foodie barack obama who offeredng up this tweet 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. Ti 2016 republican president ial candidate jeb bush tweeted categorically, you 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 when they suggested adding green peas to guacamole. In a country where people are so divided, you could unite red states, blue states. All across the aisle. I love that. I think thats fantastic. I mean im sorry theyre all hating on peas, but i think its so great. Reporter even the peas and lentil lobby oh, yes, there is one sided with tradition, tweeting, looks like were getting closer to world peas. 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 very proud of you. Reporter all shes saying is give peas a chance. Heres to you. Reporter thank you very much. Vladimir duthiers, cbs news, new york. Or pelley and thats the cbs evening news for tonight. For all of us at cbs news all around the world, good night. Captioning sponsored by cbs captioned by Media Access Group at wgbh access. Wgbh. Org Linda Macdonald is captioning for you in real time. A young woman killed at a Popular San Francisco tourist spot. Its a crime thats random and hard to understand. She was out for an evening stroll with her dad when a stranger opened fire. Good evening, im veronica de la cruz. Im ken bastida. Police say the shooting at pier 14 was completely unprovoked. And it happened so quickly, the victim didnt even know that she was hit by a bullet. Kpix 5s andria borba on what were learning about the suspect and a family that is now coping with a tremendous loss. Reporter the suspects name is Francisco Sanchez. His last residence was texas. They dont know why he attacked this woman. She was a beautiful person. Reporter with her father next to her 32yearold kate steinle was ripped from her family wednesday night. You have to realize every day is precious. Cherish the people in your life and tell them you love them. Ill never get to tell my sister that i love her again. Reporter detectives say kate was shot by Francisco Sanchez of texas on pier 14 in what looks like a random attack. My understanding is that there were no words exchanged between the suspect and the victim. The victim said something to her family that she didnt feel well. She realized something had tapped with respect to her and she fell to the ground. Reporter bystanders began performing cpr but it was too late. The pleasanton native who had