Away. Families facing tough struggles forgetting all their troubles on the open seas. Nightly news begins now. Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. It was an act of terror but with no clear motive. Remarkably a day after a young kuwaitiamerican man shot up a pair of military sites in tennessee investigators have yet to uncover the telltale pieces you would normally expect to find answering the question why. It was confirmed today that Police Fatally shot Mohammad Abdulazeez but not before he had taken the lives of four u. S. Marines. Most of them we also learned today were war veterans. The question tonight is if he believed strongly enough to kill why didnt he leave behind an explanation . Our team has been working the story all day. We want to start with kate snow. Kate good evening. Lester good evening. The fbi this evening saying they have tracked down 70 leads and though so far there is no evidence to suggest that isis directed or inspired these attacks they are investigating the crime as an act of terrorism. U. S. Officials telling nbc news that the suspect spent much of last year in the middle east and some friends and acquaintances now saying that that trip may have radicalized him. In a quiet neighborhood in the hills outside chattanooga fbi teams today removed potential evidence from the home where 24yearold Mohammad Youssuf abdulazeez lived with his parents and sisters. Investigators are now poring over abdulazeezs electronic devices, one official saying he doesnt seem to have left much of a social media footprint. But there is this, a blog created recently with a final post three days before the shootings. This life is short and bitter and the opportunity to submit to allah may pass you by. And investigators have found a visit last year to the middle east for seven months entering jordan where his father is from. As a naturalized u. S. Citizen, he carried two passports, american and jordanian. And Authorities Say thats complicating efforts to track his precise movements in the region. We have asked our intelligence partners throughout the world to provide us with any information he may have concerning his travel and other achkts while overseas. Reporter Officials Say when he returned from the middle east last november hed grown a beard and began attending religious services more frequently. I definitely think something happened in the last couple years because from what i knew of him, you can usually get like a creepy vibe off of someone. He did not put out that kind of vibe. Single pop and thn a brief second and thats when the other gunfire erupted. Reporter Army Sergeant first class robert dodge was inside the recruiting center when Authorities Say abdulazeez drove up and began firing from his mustang convertible. Law enforcement sources say one of his weapons, an ak47 type assault rifle. He did have at least two long guns which would be considered rivals or shotguns and he did have one handgun were aware of. Some of the weapons were purchased legally and some of them may not have been. We will examine them. Reporter as the suspect drove seven miles to a second location Chattanooga Police chief Fred Fletcher says police units caught up to him just before he arrived at a navy and Marine Reserve center. It was a tremendous battle. Reporter four marines were killed a navy sailor and Police Officer injured before Authorities Say it appears the shooter was taken down by police fire. They put themselves in harms way. They defended ow community. They protected themselves. And they made sure that this brutal brutal gunman harmed as few people as possible. Reporter tonight the suspects former classmates were stunned. I didnt think it could possibly be the person i knew. Reporter they knew a kind young man, a wrestler engineering student and mixed martial arts master not someone responsible for so much pain. Kate snow, nbc, chattanooga. Reporter this is miguel almaguer. Today a city paused and a community mourned. The bodies of four marines killed not at war but here at home headed for dover air base. Lance corporal squire wells was the youngest victim at just 21. He grew up in cobb georgia. His mother says he always wanted to be in the military. My son died doing what he loved for the love of his country and his family. He was loved. Hes probably the best kid you could ever meet. Reporter Sergeant Carson holmquist from wisconsin was a Maintenance Technician who served in afghanistan and was decorated with eight awards for his service. Staff Sergeant David wyatt, an artillery operations man, married to wife laurie served in afghanistan and iraq twice. 12 commendations and medals for his valor. Gunnery Sergeant Thomas sullivan was the recipient of a purple heart after two tours in iraq. The middle child of three siblings from springfield, massachusetts today his family asked neighbors to lower flags, a tribute to their tommy. The stars and stripes flew at half staff across the region a salute to the fallen tears for the brave who will never come home. My heart is breaking. Im in chattanooga, and these were men that served their country country, and that we loved because they gave it all. They gave everything they had yesterday to protect us. Reporter tonight they mourn the dead and pray for the injured. Sergeant Dennis Pedigo a husband and father with the Chattanooga Police department was shot in the ankle. He ran toward gunfire when others ran away. We care about the people here. We care about our military. We care about our law enforcement. Reporter flowers and flags have also been placed for Navy Petty Officer randall smith, shot multiple times, he was critically wounded. Community ripped apart by grief. Now coming together to take care of their own. With the end of ramadan approaching, many in the Muslim Community were set to hold a celebration at a nearby mosque. In a sign of unity they moved that gathering here to a Baptist Church to hold an Interface Organization tonight. Lester i also want to take you to a location seven miles from where we are standing where that first shooting took place. In addition to those four marines who were killed a fifth marine was wounded in the leg. Good news tonight, he has been released from the hospital. He is on his way home. Meantime back here lester we expect hundreds more to continue to gather for tonights religious service. Lester . All right, miguel thank you. And the attack leaves us with this unsettling thought, that the shooting rampage in tennessee represents what may be the new normal for domestic terror. Were talking about people unknown to authorities planning attacks all on their own. The rub, of course is that theyre virtually impossible to prevent. Lets explore that further now with our justice correspondent pete williams. Reporter the shooting rampage by Mohammad Abdulazeez appears to represent an fbi nightmare, an attack from someone inside the u. S. Who did not talk about it in advance or leave an internet footprint that could be discovered. The individuals that are the hardest to detect are the ones that are planning this in their head. Theyre not reaching out to a circle of friends. Theyre not communicating internationally. Reporter the most worrisome Terror Threat used to be thoroughly planned al qaeda operations like the 9 11 attacks or the underwear bomb plot. But by far the biggest worry now is terrorism encouraged by isis. The fbi has arrested 62 people in the past year and a half for isisinspired plots. Either attacks here or plans to fight in syria. 46 were u. S. Citizens. The cases have come from 18 states, with hundreds of people now under investigation nationwide. Examples Alexander Ciccolo of boston arrested july 4th, charged with plotting to attack a college dorm. The fbi says he told an interrogator that isis would never hurt anyone innocent. People that you see being executed are criminals. Theyre the lowest of the low. Reporter Elton Simpson and nadir nadir soofi of phoenix were killed while attacking the draw muhammad contest in texas. Warning bulletins have repeatedly stressed an isis emphasis on continual targeting of military. In response the military has put all u. S. Bases on a higher level of alert. But that doesnt apply to the more than 2,000 recruiting and reserve centers. Like the ones attacks yesterday where military personnel are prohibiting from carrying guns. Now some in congress say maybe that should change. If our military fights overseas to defend america, i dont want to put them in a position where theyre defenseless here in the united states. Reporter the army chief of staff says federal law prevents arming recruiters in storefront centers but the governor of oklahoma has tonight authorized National Guardsmen in that state to carry weapons at their recruiting offices. Lester . Pete williams in our washington newsroom. Thank you. Turning now to the imposing images out of the midwest, an outbreak of tornadoes overnight including a twister that slammed, a monster twister that slammed a Small Community and left a widespread trafl destruction. More than a dozen homes destroyed, several others damaged by winds that uprooted and snapped trees. Nbcs john yang has the details. Oh my gosh. Reporter in the skies over western illinois a terrifying sight. Large wedge. Reporter a storm chaser captures two columns coming down from this single massive wedge tornado outside monmouth. On the ground flashes as the twister cuts across power lines. Oh man. This is not good. Reporter to the east tornadoes carved a trail of destruction through cameron and delvin slammed wechlt f2 twisters with peak winds of 125 miles per hour. Officials said at least 55 homes were damaged, 15 of them severely. Grain bins left twisted and flattened like soda cans. For such a small area there was a focused amount of force on this town. Reporter sam and diane charingtons chimney was toppled and their garage destroyed. Diane was home alone when the twister hit and rode it out in the baseball. Really scary. I thought i was going to die, to be quite honest. Reporter sxam pat fox headed to their basement too. I finally got nerve enough to peek out and i said oh lord theres no trees in our yard anymore. Reporter today as illinois Governor Bruce Rauner surveyed the damage utility crews already at work to restore electricity lost when the main line blew down. Despite all the destruction, amazingly, officials reported no significant injuries during a night of powerful tornadoes. John yang, nbc news. A secretly recorded video released this week has caused a collision of medicine politics and abortion rights. And its put planned parenthood in damage control mode, apologizing for the tone of one of its officials caught on that tape. But the group that made the video says this isnt over that theres more to come. We get more tonight from nbcs hallie jackson. Reporter in a controversial undercover video released online this week the senior director of medical services for planned parenthood sipping from a wine glass talks about the process for donating tissue from aborted fetuses for medical research. Shot by an antiabortion group, the center for medical progress, the heavily edited footage implies planned parenthood is money off the tissue donations, which would be against the law. I would say probably anywhere from 30 to 100. Reporter now the head of plantned parenthood says she should have been more careful and apologized p. I apologize for the tone and statements p. Reporter but planned parenthood is not apologizing for the tissue donations themselves calling them legal and ethical, explaining any money collected is only used to cover costs. The allegation that planned parenthood profits in any way from tissue donation is not true. Reporter conservative lawmakers are using the video shot a year ago but rolling out now as a spring board to launch hearings on planned parenthood. I could talk about the video but i think id vomit trying to talk about it. Its disgusting. Reporter fetal tissue has been key to some Major Medical advances like vaccines for measles and polio and researchers are look using it to look for a cure for parkinsons disease and to help people with crushed spinal cords. But last year twice as much funding went to research on embryonic stem cells compared to fetal tissue. Some question whether its medical value is porth the political fight. Its not illegal to use fetal tissue. Its just because its so tied in to the terribly divisive and difficult issue of elective abortion it remains controversial. So far three states have opened their own investigations into local clinics. The white house is deferring questions about the ethics of the fetal tissue donations to planned parenthood. Lester . Hallie jackson, thank you. Still ahead tornths tonight the pressure to be liked online. Social media causing social anxiety for our kids, and what experts say parents can do to help. Hell tell us everything he knows very shortly, sir. 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Based on how many people like a post. I do feel as if the more likes that i get the happier i will be. Reporter of the 92 of teens who say they go online daily a quarter of them are connected almost constantly. Teens on facebook average 150 friends. On instagram 100 friends. Experts say thats a lot of social pressure a lot of voices liking or not liking. Who doesnt like to get likes . You know. Weve all been handed these devices without education. I like to equate it to throwing a child in a pool without any swimming lessons. Reporter sometimes what they see yobl canonline can hurt. Its called fomo, fear of missing out. Sometimes i do have fomo because like sometimes i wont get invited to something and my friends will start posting it on social media and theron ill like be upset that i wasnt invited. Reporter experts say its important for parents to set boundaries boundaries. So parents, do not lose your moral compass. Done lose your parental authority. Do not cave. You have to be in their head. Your kids have to think about the things you taught them. Reporter these teens dont let social media define them. I also like to see my friends in person and kind of have that sort of social face to face. Some people are going to like it. Some people are not. Just have to deal with. Best friends online but careful to stay connected to the real world. Rehema ellis, nbc news roslyn new york. Were back in a moment with why the president is breaking with tradition, skipping a hotel where he stayed and conducted business like every other president since hoover. Ry other you pay your Auto Insurance premium every month on the dot. Youre like the poster child for paying on time. And then one day you tap the bumper of a station wagon. No big deal. Until your Insurance Company jacks up your rates. You freak out. What good is having insurance if you get punished for using it . Hey insurance companies, news flash. Nobodys perfect. 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So protect them. With k9 advantix® ii. Its broadspectrum protection k ills fleas ticks and mosquitoes too. K9 advantix® ii. For the love of dog™. Iran keeps their nuclear facilities. Military sites can go uninspected. Restrictions end after 10 years. Then iran could build a Nuclear Weapon in two months. Iran has violated 20 International Agreements and is the leading state sponsor of terrorism. An update tonight on former president george h. W. Bush who remains in fair condition at a hospital in maine after falling earlier this week at home and breaking a bone in his neck. A hospital spokesman said the 91yearold bush has been moved out of intensive care where he was taken when he arrived on wednesday. Son jeb bush gave his own update today, saying when he starts telling semidirty jokes to the nurse, we know hes on the rebound. And its a president ial tradition when youre in new york city. You naturally stay at the waldorf astoria. In fact every president since Herbert Hoover has stayed at the Landmark Hotel since it moved to its current midtown location in 1931. But tonight when president obama comes to new york for a fundraiser hell be making other arrangements. Any connection to the fact that a Chinese Company bought the waldorf last year raising concerns about eavesdropping . The white house isnt saying. Earlier in the day the president welcomed a woman believed to be americas oldest living veteran to the white house. Emma didlake of detroit is 110 years old. Back in 1943 as a wife and mother of five she became a private in the Womens Army Auxiliary Corps and served as a driver stateside. In the oval office the president praised her as a trailblazer. When we come back how a day on the water makes all the difference to kids facing big challenges. Man is nice. But i think women would agree. Snuggling up after is kinda nice too. 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And for the kids in a special Sailing Program its a daylong passage to freedom from the challenges they face. Nbcs ron mott has tonights making a difference report. Reporter on a sunny south florida day a 122foot antique yacht has been transformed into a floating paradise for kids. Yay reporter theres dancing, manatee watching even a chance to take the helm. Very good very good. Reporter but best of all, there are no doctors, no nurses no medicine. This is freedom. This is heaven to us. Reporter like all of the kids on this boat katy gormans 5yearold son kalin is battling a lifethreatening illness. Kalin has a congenital heart defect. Soon hell need a transplant. Their lives an endless cycle of appointments medications and treatments. But aboard the mariner 3 the hospital feels far away. Ton have to worry about his heart right now and absorb all this sunshine and to be with other children that are similar to him, this is wonderful for us. Reporter which is exactly what john willer hoped for when he founded freedom waters ten years ago. A six fooim canceltime cancer survivor weller wanted to share his love of the water with the kids he met in treatment. From reality, and to be on a boat like this is something very very special. Reporter the families agree. Beautiful day. Its sunny. Just a wonderful time. They give us a chance to take a break for a little while and just relax. Reporter when they step onto the shore, their battles will continue. But for now they just get to be kids on a boat. Ron mott nbc news. Thatll do it for us on this friday night. Im lester holt. For all of us at nbc news thank you for watching. Have a great weekend, and good night. After that big night, its caitlyns day at the races. With so much speculation about that new friend in her life. As a woman