the trend goes even cooler to thursday but a hotter weekend coming our way but not nearly 100 degrees. thank goodness. >> thanks for joining us. on our broadcast tonight, deadly school shooting. a gunman opens fire, a chilling and all too familiar scene. students again forced to run with their hands over their heads. tonight the president sounds off on this issue with anger and frustration. >> fatal mistake. five americans killed by friendly fire, an american bomber overhead. now begins the investigation into how it could have happened. what hillary wants, perhaps more than being president. tonight what she says could keep her from running. hidden danger. the new warning about millions of americans living with diabetes without knowing it. "nightly news" begins now. from nbc world headquarters in new york, this is "nbc nightly news" with brian williams.

again sadly tonight we begin with the latest word of the latest school shooting in this country. today it was a high school in oregon. before we take you there, we're going to show you the frustration and anger evident in the president's comments late this afternoon when he was asked about the seemingly nonstop string of violent acts inside public facilities, where our children are supposed to be safe. >> we're the only developed country on earth where this happens. and it happens now once a week. and it's a one-day story. there is no place else like this. the united states does not have a monopoly on crazy people. it -- it's -- it's not the only country that has psychosis. and yet we kill each other in these -- in these mass shootings at rates that are exponentially

higher than any place else. what's the difference? the difference is these guys can stack up a bunch of ammunition in their houses, and that's sort of par for the course. to the president's point there about once a week, in fact according to this new group, every town for gun safety, 74 incidents in the 18 months since newtown averages out to about once a week. it has now happened again. we're going to begin tonight in troutdale, oregon, a fatal shooting on the next to the last day of school before summer vacation. nbc's miguel almaguer is there for us tonight. miguel, good evening. >> reporter: brian, good evening. students were waiting for the morning bell when instead they were greeted by the sounds of gunfire. it sent so many scrambling for their lives.

two students, including the shooter are dead. at 8:00 a.m., emergency calls come in. >> we've got shots fired. >> all we have at this point is possibly wearing a flak jacket armed with an assault rifle. >> reporter: multnomah county's sheriff's department, police in helmets and tactical gear, move in. a gunman is on the loose. jake blaylock saw the gunman. >> he was going after one of our teachers. >> reporter: the track coach was injured. authorities say he will recover. a popular athlete was killed. >> a gunman shot one student. unfortunately that student has died. the gunman was located and the gunman is also deceased. >> reporter: the lone gunman has been identified, but police are not releasing his name, and will only say he was armed with a rifle. a law enforcement source tells

nbc news he was a student and it's believed the gunman took his own life. >> this is not supposed to happen to any school or to any child. but we will get through this together. >> reporter: students hunkered down while officers swept the school, classroom by classroom. >> the cops came in with their guns and evacuated us all out. >> we saw people running everywhere, people screaming. we didn't know what was going on. we all went to the back of the classroom, all scared. >> reporter: frantic parents gathered just off campus, tense moments as they waited for their children. >> i just want to hug my girl. i just want to hold her. i just want to hold her tight. and get her home. >> until you hear the final word, you always have the thought. >> reporter: one by one, students emerged, tearful reunions, families embracing, denise blaylock finally back with son blake.

>> emotions fill you. you just have to touch him and know he's okay. >> reporter: tonight many have questions. what was the shooter's motive? why the bloodshed in this latest shooting that's claimed more lives? as students were rushed to safety, police frisked everyone just as a precaution. during that search, they tell us another student was found with a gun. another footnote on a deadly day that has so many people shaking their heads. brian? >> miguel almaguer on this latest tragedy unfolding in oregon, miguel, thanks. tonight an investigation is under way in afghanistan after five americans were killed by friendly fire. a strike from one of our own b-1 bombers above. jim miklaszewski is at the pentagon tonight with that they're telling us there. jim, good evening. >> reporter: good evening, brian. for u.s. military forces, this is the deadliest incident of friendly fire in nearly 13 years of the afghanistan war. it's one of the most heart-wrenching moments for any military family, a casualty

officer arriving today to officially tell them their loved one has died in the war. the family welcomed reporters after they learned that their son, their brother, 19-year-old army private first class aaron tappin of illinois was one of those killed by friendly fire in afghanistan. u.s. defense officials report the five americans, three special forces green berets, and two other u.s. soldiers, were killed while on a joint mission with afghan forces in southern afghanistan. they were checking village security in advance of this weekend's presidential runoff elections when, without warning, they were ambushed by taliban forces. an attack so fierce, the americans desperately radioed for combat air cover. an american b-1 bomber quickly responded and unleashed at least one precision-guided bomb, but instead of the enemy, it struck the friendly forces, killing the five americans and one afghan soldier. >> we do have reason to suspect

that friendly fire was the cause here, specifically friendly fire from the air, but the issue is under investigation. >> reporter: there have been 23 friendly fire incidents during the entire afghanistan war, resulting in the deaths of 40 u.s. coalition and afghan forces. besides the five killed this week, pat tillman, the nfl star who enlisted and joined the ranks of the elite army rangers, was the only other american killed by friendly fire in afghanistan. the taliban ambush came as america's longest war is winding down, and most american troops are preparing to withdraw by the end of this year. there's growing concern that taliban may try to step in and re-claim their power. officials here at the pentagon tell us it's just way too early is to tell what went wrong in this fatal bombing. was it human or mechanical error? the military has already launched an investigation to try to figure it out, brian.

>> our pentagon correspondent jim miklaszewski tonight, jim, thanks. there's grim news tonight about the other of our nation's dual wars, the war in iraq. after all the american lives there were lost, all those who came home grievously wounded, the second largest city mosul has fallen to the control of an al qaeda offshoot that is also advancing in syria. our chief correspondent richard engle, who spend years of course covering the war in iraq, is overseas with more on this. good evening. >> reporter: good evening, brian. this is profoundly significant. this is not a tiny city. this is mosul, home to millions, controlled by an al qaeda offshoot that's actually even more radical than al qaeda. there was some heavy fighting, but mostly the iraqi security forces on which the united states spent billions of dollars and years training, mostly those iraqi forces just walked away from their posts.

they dropped their uniforms. they were scattered on the roads. the militants seized weapons, equipment, a lot of money. they seized buildings. tens of thousands of citizens fled the city. this is all directly linked to syria. for years, syria has been pretty much ignored black hole. militants in syria cross the border, they linked up with militants in iraq. now there's one open front between the two countries. all week, brian, we've been talking about the potential threat of those five taliban militants released in exchange for bergdahl. many u.s. military officials i've spoken to say these militants in syria and iraq, tens of thousands of them are far more dangerous to the region and to us. >> richard engel on the latest reporting for us tonight, richard, thanks. back in this country, hillary clinton continues to make headlines, including what she said in an interview with our own cynthia mcfadden, who spoke with the former secretary of state at her new york office yesterday, the first time she's allowed cameras on a tour. cynthia is here in the studio joining us once again. cynthia, good evening.

>> good evening, brian. critics say her tenure as secretary of state was devoid of accomplishments. hillary clinton gives herself an "a" in the job. her hardest choice was going against the advice of other cabinet members and urging the president to move fraud with the attack that killed osama bin laden. her next hard choice? whether to run for president. i know you say you haven't made up your mind, but i'm going to give you the evidence from your book why i think you are actually running for president. >> okay. >> it's in the context of your mother's death. >> oh, right. >> writing about her, she would say never rest on your laurels, never quit, never stop working to make the world a better place. that's our unfinished business. >> it is our unfinished business, but i think there's more than one way to finish the business. >> reporter: one way, she says, is to continue her work at the foundation her husband started. is this your hall? this corridor here, is this your initiative? >> yes, these are the people who

are working directly with me. >> reporter: barbara bush recently said there should be people besides bushes and clintons who run for president. >> don't you just love her? she's outspoken and lays it on the line. thankfully this is still a free country, and despite all the obstacles for running for president, anyone can. >> reporter: i want to know what makes it a hard choice. what's on the other side? what's against running for president? >> i have been on this high-wire of american politics and then american diplomacy for more than 20 years. i am about to become a grandmother in the fall, which i know will change my life. i don't know how i'm going to feel about that. i want to feel the feelings around becoming a grandmother. i don't want to be focused on something two years away. i want to be focused on this baby right in front of me. i love my life right now. >> reporter: is being in the midst of all the politics of it, is that a factor? >> it is a factor. i think anybody who says it isn't either has never done it or may be trying to downplay it. it is.

our politics right now are very contentious, very dysfunctional. >> reporter: her 365-page book generally sidesteps controversy, while galloping through the nearly million miles she traveled representing the u.s. the low point, of course, the death of ambassador christopher stevens and three others in benghazi, a reminder prominent in her office. >> that's chris stevens. that picture was given to me by a young foreign service officer who was one of his best friends. she want, i want you to remember what a kind and good man he was, and how he did what he believed in. >> reporter: if you had one do-over from your four years -- >> it would be benghazi. if i could turn the clock back and we could have figured out a way to avoid it, we certainly would have. >> reporter: looking back, is there anything you personally feel you could have done differently?

>> well, in retrospect, if i had upended the way security decisions are made by security professionals, maybe, maybe not. because i'm not a security professional. i mean, we set up a system where the people who are both on the ground and with experience back in washington make these decisions. i think that's right, although in this case, the findings were that they should have done more. >> reporter: you have had said repeatedly you take responsibility for what happened in benghazi. >> i do. >> reporter: doesn't that include testifying in front of congress if they want you? >> we'll see. whether they do or they don't, i'm not going to prejudge it. >> reporter: you write in great detail in the book what was happening in benghazi as it evolved. did you keep a diary during your time? >> i kept a lot of notes. >> reporter: if the committee wants your notes, would you turn them over? >> they can read it in the book. let's see whether this is on the level or not, because that really matters to me. i don't want to be part of something which in any way politicizes or demeans the sacrifice that we saw happen there. >> of course there are plenty of

people who believe it is hillary clinton who is politicizing the tragedy in benghazi. brian? >> interesting conversation, interesting book roll-out. cynthia mcfadden, a pleasure as always. we're back with more from new york on this tuesday night right after this.

>> this is chuck todd in washington with breaking news. a major political upset in tonight's virginia primary in the seventh congressional district. house majority leard, eric cantor, the number two republican in the house, lost his bid for re-election and a nomination to a first-time politician and economics professor dave brat. this has been a one issue campaign for mr. brat. he was fully against any immigration reform. this is a loss that's going to have major political and policy repercussions here in washington. we'll have much more tomorrow morning on "the today show." now back to you, brian. >> as we mentioned, the cdc said today the number of americans living with dibeet tease

continues to climb dramatically and 1 in 4 don't know they have it. our report tonight from tom costello. >> reporter: at mt. sinai, susan lugar was in for a checkup. just three months ago she wasn't feeling so well. >> i had to go to the bathroom very often. i was thirsty a lot and i was tired. >> reporter: the diagnosis type 2 diabetes, the same disease that tom hanks was surprised to learn he has. >> type 2 diabetes is treatable by lifestyle and decent medical care. >> reporter: today new stats from the centers for disease control shows the epidemic continues to grow at an alarming rate. more than 29 million people in the u.s. have diabetes, close to 10% of the population, yet a quarter of those people don't know they're diabetic. also concerning, more than 1 in 3 americans are prediabetic,

elevated blood sugar levels that put them at risk for type 2 diabetes. >> we really need to sound the alarm and make sure people are focusing on and appreciating that this is serious. >> reporter: the finger prick and blood test are a dailiryup for dibets. for nondiabetics, doctors like to see a fasting level under 100. between 100 and 125 is a sign of prediabetes, and full diabetes is diagnosed when the blood sugar level is over 125. diabetes are at an increased risk of vision loss, heart disease, stroke, kidney failure, amputation, even death. >> in many cases, the stack is decked against people with diabetes, who are more likely to develop it because they have a stronger genetic risk. >> reporter: with medication and a diet change, susan now has her diabetes under control. >> my blood pressure is much lower, and i've lost six pounds in three months. >> reporter: but avoiding the complications from diabetes takes a lifelong commitment.

tom costello, nbc news, washington. another break and we're back in a moment with one of the most beautiful signs of the season and incredible transformation to report.

a judge has ruled that california's tenure protections for public schoolteachers are unconstitutional. nine students sued the state arguing tenure has made it next to impossible to fire bad teachers. lawyers for the teachers say the tenure protects academic freedom. getting rid of it would allow teachers to be fired on a whim. california teachers association is tonight vowing an appeal. a lot of people will be watching this outcome. the american medical association says cheerleading should be considered a sport because of the physical rigor and risk involved which, if you have one in the family, you know is way more than other sports. in fact, scholastic and collegiate cheerleading is a leading cause of catastrophic injuries in female athletes

especially and the they're calling for greater safety measures. apple likes its own plugs that fits its own products. well, today they kept quiet on reports in the industry press that they are thinking of ending their use of the standard headphone jack, that mini plug we all use, in favor of their own lightning port where the charger goes. the term in the industry for such universal fittings and jacks is a legacy port. apple just bought the beatz headphone business and consumers worry about owning obsolete headphones and accessories. checking in with the two brothers who touched so many lives. our update on what's happened in the last 24 hours.

finally here tonight, we'll end the broadcast by picking up where we left you last night, on the story of two brothers on a journey to raise awareness of cerebral palsy. we heard from so many of our viewers, touch by what they saw of this incredible bond, and our correspondent kate snow shows us what happened in the last 24 hours. >> to say i'm inspired would be an understatement. >> reporter: the gandy family never expected so much response. >> you see stories all the time that are really negative, that

people sometimes they see all those stories and they want to hold on to something that was good. i'm glad that's my boys. you know? >> reporter: it wasn't just the physical feat that people paid attention to, hunter walking 40 miles with his brother brayden strapped to his back. it was the sentiment behind the gesture. >> are you going to be able to do this? >> reporter: when it was raining and brayden was in pain, it was hunter who asked if he wanted to continue. >> if i have to push you in the stroller and that's what we have to do, then that's okay. >> reporter: and then brayden who bravely asked to keep going, and then that amazing finish. [ cheers and applause ] >> it felt great, actually. i was so proud of myself for hanging on that long. >> i see this every day. i see the love between them. >> i see the way that brayden looks at hunter like he's a superhero, and the way hunter would do absolutely anything for

his brother. >> reporter: the brothers have been close ever since brayden was a baby. they also have a sister and another brother. what they all wanted was for someone out there to be inspired. >> they can hopefully find a way to make new innovative equipment that will suit people like brayden better. >> reporter: teams of engineers have now offered to help modify or improve brayden's equipment. with many offering donations, hunter plans to spearhead the building of a new playground at brayden's elementary school. >> the walk wasn't just about me. it was about other kids with >> i'm just a 14-year-old boy, just a normal kid who had an idea. you have an idea? just go out and try it. >> reporter: kate snow, nbc news, temperance, michigan. >> that's our broadcast on a tuesday night. thank you for being with us. i'm brian williams. we of course hope to see you right back here tomorrow

evening. good night. nbc bay area news starts now. right now at 6:00, they're sold as dogs to help children with autism. but as you see here, families are claiming that they're putting their children in even more danger. thanks for joining us. >> they paid almost $10,000 for a service dog to help with their autistic children. but two bay erica families claim those dogs were untrained. one of the families has filed a civil complaint against the agency that sold them the dogs. nbc's marianne favro is live.

what exactly went wrong here? >> reporter: according to the families, a lot went wrong. the plan was for the children with autism to be tethered to the service dogs, and the dog would conceivably prevent the children from darting into a busy street like you see behind me. but that didn't happen. the families say the dogs actually pulled their kids and dragged them. 5-year-old jackson has autism. his mom, elaine, worried he may dart into traffic and get hurt. so she raised more than $9,000 to buy idaho, an autism service dog. the idea was jackson would be tethered to idaho and the dog would keep him from running off. that didn't quite work. >> idaho was tethered with jackson, and i was up ahead. and idaho bolted toward me. and jackson fell down and started to cry. and it was pretty much dragged through the mall. >> reporter: idaho is a service dog from yuma