on our broadcast tonight, flight risk. it's about to get a lot more confusing for travelers flying into the u.s. new rules for electronic devices because of what's being called a very real threat. violent holiday. what sparked so much gunfire? nearly 70 people shot on the streets of chicago or this long july fourth weekend. barrage of attacks as israelis and palestinians trading air strikes and rocket fire and new fears we are reaching a dangerous tipping point. and early detection. dogs helping doctors save lives, finding ovarian cancer with ab astonishing level of accuracy. "nightly news" begins now.

p good evening. we could be just hours away from an expected outbreak of controlled chaos and brewing anger at airports all over the world, wherever passengers are boarding direct flights to the u.s. this has to do with electronic devices and a new rule. if they aren't charged, if you can't turn it on, it doesn't make the flight. as has always been the case in this post 9/11 era, we're not allowed to know the exact nature of the threat here but air security is ramping up around the world and many are wondering is domestic travel where we will see the next round of changes? it's where we begin tonight with nbc's tom costello at reagan national airport in washington. tom, good evening. >> hi, brian. in fact, this is coming from overseas because we are told that's where are the threat is originating. passengers returning to the states from foreign airports are being told make sure you come to the airport with your electronic device fully powered. if they try to power it up while you're at the checkpoint and it

doesn't power up, you could end up leaving this device behind. from heathrow in london and frankfurt and charles degaul, an intense focus on devices. phones laptops, e-readers, game consoles and more and passengers must turn the devices on before departure to prove they're not hollowed out and packed with explosives. nbc's jim mass nbc's jim maceda is in london. >> reporter: travelers in europe flying to america could be facing big delays with those beefed up restrictions turning airports like heathrow, one of the world's busiest, into centers of mass confusion. >> reporter: homeland security raised the alerts after finding bomb-makers in yemen are focusing on personal electronics to smuggle a bomb onboard a plane, perhaps fighting

westerner in syria who hold american or european passports. at a police testing ground in 2010, federal agents showed us the danger posed by even a small amount of plastic explosives wrapped inside a laptop or a pair of shoes. >> where it's positioned in the aircraft could cause damage to the outer and inner shell of the aircraft. >> the danger with electronic devices is the ability to hide something metal like a military or commercial detonator, which makes a bomb extremely reliable. >> reporter: ibrahim assad alla siri is believed to have supplied the underwear bomb that failed to detonate on a christmas day flight in 2009. that was a chemical bomb. agents later demonstrated the explosion that could have resulted. now, a new threat. >> i think it's absolutely just a matter of time until al qaeda and associated groups attempt another aviation attack using concealed ieds. whether or not it's a matter of time until they're successful is really another question.

>> security sources stress while there's no specific immediate threat this is a general ongoing concern they have. the challenge for foreign airports is to balance the security procedures with a busy beginning of the summer tourist season. brian? >> tom costello starting us off from dca national airport in washington. tom, thanks. if this next story was datelined many the middle east, it would easily trigger days of coverage. but the dateline in this is chicago where are 67 people were shot. the death toll stands at 11 from just this weekend, making it one of the worst weekends for gun violence in decades. nbc's anne thompson is in chicago for us tonight. >> reporter: in neighborhood after neighborhood, crime scene tape wrapped the trees, police searched for evidence, and people grieved for loved ones. shooting victims as young as 14

and as old as 66, including a young mother. >> i just don't believe it. >> reporter: sandra's daughter, tonya, was killed at family barbecue. >> she was enjoying her family in the yard. that's all. >> reporter: as crowds prepared to celebrate independence day at navy pier, shootings mounted across the city with the most violence clustered on chicago's south side. during the bloodiest stretch, 13 hours starting at 2:30 sunday afternoon, 26 people were wounded and four killed. for the police superintendent, the violent weekend was all too familiar. >> ladies and gentlemen, it's groundhog day here in chicago. >> reporter: for the city's mayor, it was a call to action. >> wherever you are, wherever you live, the gun violence that was part of this weekend is totally unacceptable to anybody from the city of chicago. >> this is unheard of. this is america. >> reporter: diane latiker created her own memorial to

young people killed by violence since 1997. >> i kept running out of room. we rebuilt it 12 times. >> reporter: 374 stones and she has another 458 to go. >> there's hopelessness. when you don't have any hope you don't care about anything or anybody. >> reporter: she started kids off the block to mentor kids and help them find work. 21-year-old donte gaines is unemployed and worries about the future. >> it's a case of you kill my man and i will kill yours. it's a cycle that never ends. >> reporter: chicago police superintendent garry mccarthy blames the proliferation of guns in this city. he and other officials are demanding tougher sentences for possession of illegal weapons. in the meantime he's promising to flood high crime areas with police as they try to stem what is shaping up to be a long and deadly summer. brian? >> anne thompson on an otherwise beautiful monday night in chicago. anne, thanks. there is late word with tonight of a major settlement

approved by a federal judge for thousands of former nfl players who sued the league as they suffered the effects of hard hits and concussions. some with brain damage and dementia. the judge had denied an earlier settlement of $760 million saying it wasn't enough money to divide up for all the players involved here. the nfl has since agreed to remove a cap it placed on the size of the settlement. this deal still needs to be voted on and approved by thousands of former players and their beneficiaries. the dateline on this next story is the middle east, and a situation so tense tonight with air strikes and rocket attacks lighting up the night sky that there are full-blown fears of an intifada style outburst of violence. nbc's ayman mohyeldin is live for us tonight in jerusalem. good evening. >> reporter: good evening, brian. in the past few hours, more than 80 rockets have been fired and they have deployed hundreds of reserve soldiers to the south of the country. over the past few days,s have

been rising, so much so that there is growing concern tonight that there could be on outbreak of all-out conflict. in gaza, calls for revenge today are getting louder. the palestinian militants vow to avenge fighters killed by israel air strikes and israel says it will intensify attacks to stop palestinian rocket fire. both sides exchanging more rhetoric while palestinian and israeli parents still grieve for their children. rahel frankell is the mother of a 16-year-old american teenager buried last week along with two other jewish teens killed by suspected palestinian militants still at large. >> no mother or father should go through what we're going now. we share the pain of the other parents. >> reporter: today, mohammad's father took me to the streets and showed me where his 17-year-old son, a palestinian, was kidnapped before he was burned alive by suspected jewish extremists. before we arrived, israel's

prime minister called him and offered his condolences, condemning the murder and saying the suspects who were arrested will be brought to justice. mohammad's murder, considered a revenge attack from the three jewish teens triggered widespread clasheses in east jerusalem. and an american teenager from florida was caught up in the fighting and was severely beaten when police arrested him. his beating was captured in a video that went viral and triggered outrage among palestinians. when thousands attended mohammad's funeral, he was in jail and couldn't say good-bye. >> do you feel bad about not being there? >> i feel so bad. i missed the chance to see him for the last time. >> reporter: today, we joined him and his father as they visited mohamed's grave to pay their financial respects, a moment of peace amid the looming threat of war. brian, this evening, in an attempt at a cease-fire between palestinian factions and israel has failed. here in jerusalem, there are growing tensions and return of

violence in the eastern part of the city between palestinian protesters and israeli security forces there is growing concern it could spread to other cities inside israel. >> ayman mohyeldin, jerusalem for us tonight. thanks. a closely watched meeting at the vatican today as pope francis met with six victims of clergy sex abuse, the first meeting of its kind for this pope who begged for their forgiveness. some abuse survivors were less charitable today and called this meeting a pr event saying they don't expect much to change. all eyes on the pacific rim tonight including americans with family in the region watching a massive typhoon that may break records for this time of year. the entire nation of japan falls within the cone of the predicted path of the typhoon neoguri, the strongest thus far in 2014. sustained winds may top 130 miles an hour.

and communications with okinawa and japan will be difficult as these next two days or so play out. already the u.s. has moved 60 aircraft off okinawa and 30,000 u.s. military personnel will stay in place and attempt to ride it out. now, to this ongoing crisis on the u.s. border with mexico, the white house said today most of the children coming across the border will be deported back to their home countries. this announcement comes as three more busloads arrived in san diego today. many of them children, getting pat-downs while being held behind chainlink fencing. today we start a special series about the desperate journey of the children trying to get into this country. our coverage begins in a place dangerous enough to make people flee there to escape. stephanie gosk reports from san pedro ro sulo in honduras. >> reporter: border patrols in honduras have a problem.

it doesn't have the resources to stop unaccompanied minors from heading to the u.s. >> the honduran police are taking us to a spot they call a blind spot. they freely admit there are parts of this border with guatemala they just can't patrol. it's where unaccompanied kids leaving without their parents cross. the rest of the journey happens on foot, a tough climb up steep hills. on the other side is guatemala. this team has just one vehicle and 20 officers to patrol 45 miles. the commander worries about the children's safety. because of the many dangers along the road, he says. there are kids like these teenagers who live in san pedro sula, what many call the murder capital of the world. they did not want their faces on camera. i asked how many want go to the u.s.? every hand went up. this neighborhood is controlled by four drug dealing gangs who battle for territory. a local youth center is one of the only safe places for kids to

come and play. this 15-year-old says his older brother is in a gang. an ak-47 is in the house and he's scared. a familiar story to e.r. pediatrician david mendoza. on a busy night he will see seven or eight victims of violence. the parents of this 17-year-old boy in a coma say he was shot because he wouldn't join a gang. mendoza believes the violence is driving honduran kids out and changes to u.s. immigration law won't stop them. >> even though they have stopped them at the borders and send them back home, they are going to go back again. they come here and they still -- we haven't changed. >> reporter: for many, the uncertainty of the road ahead appears worth the risk when life at home is already so dangerous. stephanie gosk, nbc news, san pedro sula, honduras. and still ahead on our

broadcast tonight, from the world of medicine in the fight against ovarian cancer, how dogs are helping doctors root out one of the deadliest kinds making the correct diagnosis with over 90% accuracy.

back now as promised with medical news about how dogs can help doctors save lives by detecting one of the deadliest forms of cancer -- ovarian cancer -- with an astonishing level of accuracy, one of them finding cancer correctly about 90% of the time.

we get our report tonight from our chief medical editor, dr. nancy snyderman. >> reporter: a morning jog gives caroline gnu some time to get to know her springer spaniel mcbain. she fosters the dog while he takes part in a new program at the university of pennsylvania school of veterinary medicine. >> he's been an incredible addition to my life. he's changed my life. >> he's got cancer detection. >> reporter: he's working hard to change the lives of three other women. mcbain and three other dogs are being trained in hopes of developing a screening test that could identify ovarian cancer in its early stages. >> ready go to work? >> reporter: dr. cynthia otto runs the program. >> our goal is not to put a dog

in every hospital, a lab in every lab. what we really want to do is help refine the technology by using the exquisite ability of the dog's nose. >> reporter: a dog's nose knows. a dog's sense of smell is about 100 times more sensitive than a human's. here's how it works. the dogs learn the scents of chemicals emitted from ovarian tissue and blood and they are rewarded when they stop in front of the cancer positive sample on this wheel. >> good job! >> reporter: eventually cancer doctors at the abramson canter center will collaborate with chemists and physicists. the goal is to develop an electronic nose specific to ovarian cancer that will duplicate what the dogs are naturally able to do. barbara was diagnosed with advanced ovarian cancer. she donated her tissue samples to the study in hopes of finding a test that would spare other women the ordeal she's gone through. >> anything to prevent women from going through in the future would be great.

i'm glad i'm a part of it. >> dogs have already been used to prevent brain cancer and melanoma. with this, it's hoped it will be used for general use in the next couple of years so far proven so accurate, it's over 90% accurate. >> all the more reason to love and admire these animals. nancy snyderman, thanks. >> you bet. we're back in a moment with a frighteningly close call on the runway, a last second move to avert disaster.

eduard shevardnadze has died, an old school communist drafted into the thinking of mikhail gorbachev and they went on to make foreign policy and ease the cold war, warm relationships with the u.s., all in ways largely reversed today. shevardnadze went on to run the former soviet georgia. after that came to a tumultuous end, he admitted too much democracy was a bad thing. he was 86 years old. a rare appearance on video by abu bakr al baghdadi.

it's a video calling on muslims to obey him. much of the media attention went to his wrist, specifically a watch that experts say appears to be p either an omega speed master or rolex daytona, a pricey possession that would contradict his sermon about virtue and modesty. two close calls in the air, and on the ground of late. the less serious one came from raf waddington in the uk. a tush a turkish pilot had a little fun with the crowd on the runway. could have reached up and touched the landing gear. they were there to see an air show. an amateur plane watcher in barcelona witnessed this. airbus taxiing on to a runway as a plane was on final approach. the russian jet put up the nose and put the throttle forward and avert add disaster. this was a dark weekend in hollywood coming off an awful weekend in the box office. the worst box office showing on

a july 4th weekend since the '80s. variety called the weekend business dreadful, off 44% from last year. "transformers" won the weekend and while "tammy" made just enough money over the weekend to cover the cost of making the film, according to one estimate in "variety." when we come back here tonight, about a boy and his best friend who lives right next door. next door.

our final story here tonight comes to us from our nbc station in the twin cities. it's about an amazing friendship in farmington, minnesota. they are next door neighbors. one of them is a world war ii veteran. the other is a good many years his junior. we get their story tonight from correspondent boyd hubert of kaer tv. >> reporter: emmitt richner is 3 going on 4. for no particular reason, he is driving with his eyes closed, which would not appear to be going particularly well. fortunately, emmitt has a mentor. >> i've got a bagger that sits on the back. >> reporter: this gentleman is 89, going on 90. and this has been going on --

>> ready, set, go! >> reporter: -- for nearly a year. emmitt's parents had to laugh. >> he blocked me out. >> reporter: the first time they saw their preschool racing a man who fought in the second world war. >> i told you he was fast. >> i'm super fast. you want to play kcroquet? >> which stick are you going to have? >> reporter: the man they waved to but barely knew from the house -- >> right through. >> reporter: -- next door. >> they're together pretty much every day. >> reporter: emmitt first cross ared into the yard when he caught a glimpse of his favorite food. >> these are yellow flowers? >> reporter: of his >> those are going to be tomatoes. >> every time he saw me out there, got any matos? >> can you throw a baseball to me? >> reporter: every day, a new adventure. >> one day i looked out the

window and i took this picture, it was just so cute, he was snow blowing past from his back door straight to our back door so they could visit. he's just taught him so much. >> reporter: which is why those tears have been coming more often. >> we decided back a month ago to move. >> reporter: brian richner says their growing family simply needs more space. >> i love him. >> it is the hardest part about moving. >> it's tough. it's tough. >> reporter: and change is coming for early, too. his wife is ill. just days ago, his kids finally convinced him it's time to trade his house and yard for a senior apartment. >> come over here! >> reporter: 'til moving trucks roll -- >> i can hear you. >> reporter: good-bye will have to wait. >> put a washer on. >> reporter: this january-december friendship still has a bittersweet july. >> so you put the washer on first?

>> that's right. >> reporter: for nbc news. boyd hupert, farmington, minnesota. >> looks like it's tight. >> what can we say after that? that's our broadcast on this monday night as we start off a new week. thank you for being with us. i'm brian williams. we hope to see you right back here tomorrow evening. we hope to see you right back here tomorrow evening. good night. -- captions by vitac -- www.vitac.com nbc bay area news starts now. >> jailhouse! right now at 6:00, rising tension in the north bay after a major announcement. a sheriff's deputy will not be charged in the shooting death of a 13-year-old boy. >> no criminal charges will be filed against the santa rosa sheriff's deputy who shot and killed a teenager carrying a

fake gun. the deputy was cleared. and there is anger on the streets of santa rosa tonight. in the past half hour, a band of protesters have begun marching and are marching toward the memorial for andy lopez. we have the story from santa rosa. >> reporter: 13-year-old andy lopez was shot last object while carrying a toy gun near a field that served as a neighborhood playgrou playground. its is made to resemble this gun. the deputy called for backup, believing that the gun was real. >> i want to begin by re-stating that this is a tragedy and our hearts go out to the family. >> reporter: she pored over reports from witnesses and law enforcement. >> investigation was extensive and exhausti