Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. A scene of carnage amid a rising death toll at the International Airport at istanbul, turkey after multiple suicide bombings left 60 dead. Multiple injured. This video appears to be the lower level of the international terminal. It appears to be the lower level of the international level. The tape not verified by nbc news. In another unverified video, an attacker appears to be shot by police and moments later detonates his explosives. It was late evening in istanbul when the terror attack happened. The explosion sending passengers and workers for cover. Bill neely has late details. Reporter its minutes after the bombs exploded scores are dead and injured and there is panic. And their families are fleeing the main airport in istanbul. Turkish Officials Say at least three suicide bombers blew themself up at the arrival area of the main terminal. This happened at the arrivals area. Yes. In arrivals, yes. Did you hear an explosion . There was gunfire . You know, guns. Reporter they would open fire first with automatic weapons. Police returned fire but it didnt stop the terrorists. This cc tv footage on a computer appears to show the moment of one of the explosions. This was a coordinated, as well as a deadly assault on the third Busiest Airport in europe. It was crowded as the terrorists struck. They reached a Security Check point but didnt get inside the main hall. Another video appears to show one of the falling and detonating his explosives. As ambulances arrive to recover the dead and wounded, taxi drivers leaving the terminal shouted dont enter, a bomb has exploded. Its not the first time istanbuls airports have been attacked. No one has yet claimed this attack but suspicion is falling on two groups, isis ex kurdish separatists. Turkey and istanbul braced for more and angry. Bill neely, nbc news london. We want to go to Richard Engel in istanbul. Hes made his way to the airport. Richard, what can you tell us from there . Reporter well, the police have sealed off this area. We cant get any closer to the terminal which you can see behind me. We see startled passengers coming out here carrying their babies, dragging their luggage. We reported several weeks ago, lester, that isis had rw to turkey with the intention of carrying out attacks on an International Scale during the month of ramadan. Its supposed to last for one more week. Today i was told this attack was highly likely the work of those same militants who had been deployed and this could be just the start of a series of attacks before ramadan is over. All right. Richard engel in istanbul for us. Thank you, richard. The attack comes three months after the attacks at brussels, including the airport bombing in which International Travelers seem to be among the targets. The security is very much of concern to american aviation officials that must ensure foreign airports offer security as good as or better as those in the u. S. Nbcs tom costello has the breaking story. Reporter the biggest concern to u. S. Aviation security an lists that an an lists that alists that anny overseas terrorist will get on a u. S. Bound flight attacking passengers and the plane or landing in the u. S. And staging an attack here. Any foreign airport with direct flights to the u. S. Must compile with tsa Airport Security protocols. Tsa visits them undercover. Tsa chief, we inspect those airports to ensure they meet the standings and that requires that includes the people on the aircraft, the crews that manage the aircraft, the people that service the aircraft and cargo on board. Reporter it was just three months ago the terrorists attacked the airport and subway station in brussels. 32 dead and 300 injured. Hubs remain attractive soft targets because of the potential for mass casualties while inflecting economic harm. In the u. S. Perimeter security can vary from airport to airport and the number of armed police are determined by local jurisdictions. Airports arent built with castles. They are not built th quite frankly. A lot are built for shopping. Transportation and shopping. Reporter whether overseas or at home, Security Experts rely on the publics help. Watch out for people that seem to be surveilling a location, gathering information about patterns like shift changes and testing security perhaps with false alarms. Tonight federal authorities report no immediate change to the security poster of airports here in the u. S. But some cities like the new york city airport, there will be highly visible Police Tactical units on patrol, lester . Thank you. Well continue to monitor the situation in istanbul and bring you the latest developments. We do want to switch gears to another attack at the u. S. Consulate in benghazi. It does raise questions about the u. S. Response that night. Nbcs Andrea Mitchell reports. Reporter benghazi in flames and the death of four americans including u. S. Ambassador chris stevens. Congressional investigations later. In an 800page report House Republicans blaming the white house, state department and pentagon especially the military for not deploying r nearly 11 hours after the first shots were fired. Not a single wheel was turning towards libya. Reporter but no smoking gun against Hillary Clinton for failing to protect the diplomat. The degree which republicans are willing to play politics with their deaths and this tragedy is appalling. Reporter on the night of the attack, a twohour white house Video Conference and the pentagon and clinton, state Department Officials arguing the marines should wear civilian clothes to avoid upsetting the Libyan Government and one commander telling investigators when they finally had a plane during the course of three hours, he and his marines changed in and out of officials missing warnings not anticipating the second attack. That killed two more americans. The vice chairman of the joint chief skipping the meetings to host a dinner party at home. Weve been told forever now no military asset could reach benghazi in time and we know thats true because nothing was headed toward benghazi. Reporter and no evacuation plan. The cia relying on former soldiers from their old enemy gaddafi. Still, with i still, with inop evidence of clintons role. Ill leave it to others to characterize this report. Reporter but donald trump isnt letting go tweeting benghazi is another Hillary Clinton failure. The committee spent two years and 7 million along the way stumbling into the fact that clinton used a private email server that could be the most important result of the committees work, lester . Andrea mitchell, thank you. Newly obtained Surveillance Video shows moments when t white house grounds last month. The secret service said he was shot for refusing to drop the gun he was carrying and caution, one of the scenes is graphic. Pete williams has details. Reporter word of shots fired at the white house put washington on edge last month. A newly released Surveillance Video dramatically reveals what happened. The secret service says a 31yearold man jesse olivien of pennsylvania walked toward the white house carrying a handgun. Its clearly visible. Secret Service Takes positions. He continues walking ignoring commands to drop the gun. As he approaches Security Check points disobeying, secret Service Agent out of frame to the left points disobeying, secret Service Agent out of frame to the left s disobeying, secret Service Agent out of frame to the lef sti disobeying, secret Service Agent out of frame to the lefl disobeying, secret Service Agent out of frame to the lefl disobeying, secret Service Agent out of frame to the left shoots him once. Render first aid. He survives and taken to a waiting ambulance and on to a hospital for surgery. On monday his lawyer asked that he be released to home detention pending trial but the judge said hes a danger to the community. The secret service says he told an officer he came to the white house quote to shoot people. Pete williams, nbc news, washington. A number of crew members are missing after two trains collided in a fiery headon cash in texas. Boxcars erupted in a ball of flames forcing authorities to evacuate nearby residents out of fear for their safety. Nbcs Gabe Gutierrez has the latest. Reporter in north texas a blazing inferno, this video capturing the moments after impact showing boxcars falling like dominos next to a growing fire ball. Just before 9 00 a. M. Two freight trains 30 miles northeast colliding near the town of panhandle. Cargo containers crumbled and burning as authorities rush to rescue the crew members on board. Do we have any entrapment at this time . Yes, sir, we have three. Reporter county Officials Say one of jumped from one of the trains and is in the hospital and three others still missing. Were at a standstill trying to get the fire contained. Reporter after last years amtrak derailment in philadelphia, federal officials called for more use of positive train control for preventing collisions. In this case, the Burlington NorthernSanta Fe Railway company says it appears this is the type of the incident that ptc is intended to prevent. This is why we have been aggressively deploying ptc across our network. Voluntary evacuations are now underway. Just a massive black smoke coming up, you know, just like burning up diesel fuel. Reporter so far no word on what caused the crash. Gabe gutierrez, nbc news. Tonight, tributes are pouring in from across the country for one of the greatest coaches of all time. Pat summitt, a longtime coach of the to eight National Championships died with a battle of early onset alzheimers disease. She was just 64 years old. Nbcs Cynthia Mcfadden looks back at her extraordinary life. Reporter pat summitt had a lot of experience with winning. No woman or man ever won more College Basketball games than she did. Nearly 40 years at the university of tennessee her beloved lady vols never lost a season. All her charm reporter she was a fierce competitor and none of her players wanted to see her blue stair after a bad play. She was constantly on me to every day get better and push myself to her standard. Reporter and summitts standards were high. Her team won eight National Championships but the best stat, 100 of the young women who played four years for her graduated from college. You did things the right way. I mean, she never had a bad day. She never had an off day, and she meant a lot to me. Reporter in the end, she was a life coach as much as a basketball one. I shared my Health Concerns with you. Reporter announcing five years ago she had been diagnosed with early onset alzheimers at only 59. My mom says it is what it is but it will be what you make it. Reporter in 2012 she was awarded the president ial medal of freedom. Anybody that feels sorry for pat will find themselves on the receiving end of that famous glare or she might punch you. Reporter her toughness securing her legacy not as t womans basketball coach but as one of the greatest coaches of all time. Cynthia mcfadden, nbc news, new york. Incredible legacy. Still ahead tonight, the regular exam that millions of women dr necessary at all. More about that. The urgent rescue mission to save life defiance is in our bones. Our citracal bones. Easily absorbed calcium plus vitamin d. Defy bone aging with citracal maximum. Our highest level of calcium plus d. Once i left the hospital after a dvt blood clot. What about my wife. What were building together. And could this happen again . I spoke to my doctor and she told me about eliquis. Eliquis treats dvt and pe blood clots and reduces the risk of them happening again. Not only does eliquis treat dvt and pe blood clots. But eliquis also had significantly less major bleeding than the standard treatment. Knowing eliquis had both. Turned around my thinking. Dont stop eliquis unless you doctor tells you to. Eliquis can cause serious, and in rare cases, fatal bleeding. Dont take eliquis if you have an artificial heart valve or abnormal bleeding. If you had a spinal injection while on eliquis call your doctor right away if you have tingling, numbness, or muscle weakness. While taking eliquis, you may bruise more easily. And it may take longer than usual for bleeding to stop. Seek immediate medical care for sudden signs of bleeding, like unusual bruising. Eliquis may increase your bleeding risk if you take certain medicines. Tell your doctor about all planned medical or dental procedures. Eliquis treats dvt pe blood clots. Plus had less major bleeding. Both made switching with new concerns were back now with new concerns being raised about an exam that over 60 million get every year. Pelvic exams have long been considered key to Womens Health but uncomfortable and intrusive and as nbcs ann thompson tells us a panel of experts is questioninet worthwhile. Reporter it is a staple of Womens Health. The often dreaded pelvic exam performed in 76 of visits to ob gyn but today a Government Advisory Panel says there is inadequate evidence this annual exam helps detect cancers, infections or sexual transmitted diseases in healthy women. We dont know what the benefits associated with the pelvic exam based on the evidence that we currently have. Reporter theres also the question of harms, such as false positives that can lead to additional tests and costs and false negatives that can incorrectly reassure women. There is wide agreement that pelvic exams are beneficial for pregnant women or those with symptoms of problems. Ob gyn doctor timyka august says todays news is a good start for discussion. She tells healthy patients the pelvic exam is optional. The majority of women absolutely want it. They just want to make sure everything is okay. Im not worried about my discomfort if its something lifechanging or saving. Reporter the American College of obstetricians and gynecologists still recommends the annual exams for women over 21 but concedes they have limitation. Todays report comes from the same group that questioned longuse screening tests like mammograms and tests for Prostate Cancer seeking solid Scientific Evidence for what have become medical rituals. Ann thompson, nbc news, new york. Were back in a moment with the ballpark intruder that caused a very close call. With usaa is awesome. Homeowners insurance Life Insurance automobile insurance i spent 20 years active duty they still refer to me as Gunnery Sergeant when i call being a usaa member because of my service in the military to pass that on to my kids something that makes me happy my name is roger zapata and im a usaa member for life. Usaa. We know what it means to serve. 92 of our members plan to stay for life. And my results ended up beinge african, european and asian. It was great because it confirmed what i ancestry helped give me a sense of identity. You dont let anything keep you thats why you drink ensure. Sidelined. With 9 grams of protein and 26 vitamins and minerals. 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Ask your doctor about cialis and a 200 savings card stop taking cialis and get medical help right away. Okawhoa ady . [ explosion ] nothing should get in the way of the things you love. Get americas fastest internet. Only from xfinity. Were back with a delicate rescue mission off the coast of Southern California this evening. The struggling whale was first spotted three days ago but on the move and time is of e it. Miguel almaguer is with rescue teams. Reporter an urgent rescue mission to save an endangered blue whale 30 miles off the coast of Southern California. This 70foot whale is entangled in 200 feet of fishing line and crab traps dragging up to 200 pounds o00 pounds of300 debris from the mouth and tail. For three days rescue teams have been trying to cut it free. With it being down 25, 30 feet into the water, it was almost impossible to really help it but i dont think he knew we were trying to help him because he took off on us after we came close to getting him. Reporter blue whales are largest in the world and by nature elusive. This blue in 2015 disappearing into the ocean after its rescue attempt failed. Abandoned in lost fishing gear is the number one cause of death for marine wildlife. To successfully pull off this rescue Mission Crews need a bit of luck. W youre next to an animal that size the potential for danger and human bodily harm is definitely there. Reporter with no way to track the whale, rescue teams are searching the vast ocean hoping to find and save one of the worlds most majestic creatures. Miguel almaguer, nbc news, dana point, california. This maybe the closest call weve seen on a baseball diamond all season. Take a look. A bird flying right in front of home plate during last nights cardinals royals matchup barely missing an 84 mile an hour pitch and the swing of the bat. Luckily escaped with just a few ruffled feathers. Look at that. When we come back, cancer moon shot. The doctor fighting to make sure all children get a fighting chance. Finally tonight, were on the eve of a summit for the cancer Moon Shot Initiative led by Vice President joe biden. Among the goals, increasing access to cutting edge treatment, so when it comes to children, one doctor found that not all treatments are equal. Rehema ellis explains what shes doing about it to save lives. Reporter it should three days after her son was born, 19yearold rayleen was diagnosed with leukemia. Hes the main reason im fighting for. In her corner one of the best doctors. At the university of new mexico comprehensive cancer center, doctors transformed cancer care for hispanics and Indian Americans dying at an alarming rate. Ive been a warrior woman. Reporter she needed to be. Dr. Wilman was startled to find in new Mexico Native American and hispanic children had a nearly zero survival rate compared to white children with leukemia on standard chemotherapy. In an unusual move. She and top researchers joined forces analyzing millions of genetic patterns and find native american and hispanic children had different genetic mutations than white children and needed treatments tailored just for them. Cancer medicine today really is personalized medicine. Reporter rayleen got that in a cutting edge cancer technique called genetic sequencing and then her own individual drug treatment. Is there a benefit nationwide . Theres no question. Our ability to develop new treatments greatly impacts the care of children everywhere. Reporter today she is in remission recovering at new mexico childrens hospital. And now with the help of her cancer moon shot team she just might. Rehema ellis, nbc news albuquerque. Tomorrow we go inside the Cancer Moon Shot Program when joe biden sits down with tom brokaw. That will do it on this tuesday night. Im lester holt. For all of us at nbc news, thank you for watching and good night. Night. Its our new intern, barts first week here at td bank, hes a robot from one of those other banks. Were training him to bank human. I am banking assistance registration technology. Wait, wait, wait. But you can call me, banking assistance registration technology. Hi amy. Thank you. Thank you. That is not protocol manager jenna. Thats ok bart, it is here. At td bank we do things differently, like having the longest hours of any bank. Dont just bank. Bank human. Famous. Kanye takes a hit for his bedful of celebrity lookalikes. Whos now calling it disturbing, even stating it makes her feel unsafe . Im melissa hernandez. Bring on the