Player who took her down . Nightly news begins now. Announcer from nbc news World Headquarters in new york this is nbc nightly news with lester holt. Good evening. Im kate snow in for lester holt. It is the case that has gripped the phoenix area in fear for nearly two weeks now, and tonight theres a potential break in the investigation. Police have detained two people calling one of them a person of interest in a series of random shootings, most along the busiest stretch of i10. This new development coming on the same day as reports of yet another shooting. Nbc News National correspondent Miguel Almaguer starts us off tonight from phoenix. Shots fired. Front drivers side windshield has a round shattered mark. Reporter today more emergency calls, more fear and frustration on the freeway. Loud pops on the highway about ten minutes ago. Reporter swarming the shopping center, Police Tracked down an suv. Inside a person of interest. Were questioning one subject in association with our ongoing investigation. Reporter for the Highway Patrol it may be a rare break. Over the last two weeks, there have been few leads. At least 11 vehicles struck by bullets or projectiles. Windows shattered, lives threatened. Its been a long few days. Its really scary driving on the freeway. Reporter police think there could be multiple shooters. With shots fired day and night. I want all arizonans to remain alert and know that this is our top priority as the State Government and as the department of public safety. Reporter today School Districts rerouted buses. Too risky to drive i10. Traffic may be down on the roadway, but its up in this emergency call center. Okay. So something hit your windshield . Reporter 911 is flooded. Most reports of false alarms. As authorities monitor hundreds of Traffic Cameras looking for a needle in a haystack. Its frustrating but youve got to remember its a very difficult case to investigate. Theres a lot of moving parts. Reporter tonight theres also a lot of highway to cover. The open road that for some feels and sounds like shots fired. Reporter the wild west. Tonight police remain questioning one person who has been detaped, detained, calling that person a person of interest. Authorities say they could be several shooters here, so they warn this case is far from being solved. Kate . Very scary. Miguel almaguer in phoenix tonight. There are new mandatory evacuation orders tonight as an explosive wildfire rages out of control in central california. Homes in danger of being consumed by flames as the fire also threatens to spread through an ancient grove of giant sequoia trees in Kings Canyon National park. Nbcs Gadi Schwartz has the latest. Reporter in fireravaged california there is a new inferno growing called the butte fire, flames so intense, so large, spreading so fast even a tv crew from nbcs sacramento station kcra was caught inside the blaze. Nearby the heat is churning out swirling firenados. Homes fully engulfed. Explosions heard within. The fires picking up and its pushing up against the few containment lines we have so far. More evacuations are under way and families are ready to get out. Just get the few things i need to take and god willing it subsides. Reporter the fire has grown to 50,000 acres in just three days. While near fresno the rough fire, californias largest fire, is now more than 119,000 acres. Its forced the evacuation of an exotic cat refuge. Lions, tigers and jaguars loaded into crates. Its best to move the animals out at this point. Reporter the rough fire is also now expanding toward the ancient sequoia forests where we climbed last week with scientists studying the effects of drought. One of the most remarkable things about the view up here, you get an overview of the forest. And unfortunately, a lot of the trees we see out there are dying because of the drought. Reporter sprinklers are being set up to protect the resilient redwoods, but in some areas up to 1 in 4 smaller trees have died. Leaving Dangerous Levels of fuel. Conditions where a tiny spark can quickly explode into unstoppable flames. During a historic fire season that has only just begun. Gadi schwartz, nbc news, los angeles. Theres been a terrible accident at one of the most holy sites in the world. A deadly crane collapse in saudi arabia at meccas grand mosque. With more than 100 people killed, many more injured. Images from the scene are still coming in tonight. We get late details from nbcs keir simmons. Reporter the terrifying moment caught on cell phone video. A towering construction crane collapsing, then panic and calls for gods mercy. It came down on top of one of the most holy places in the muslim world, meccas grand mosque, smashing through the ceiling just before evening prayer, causing carnage, too gruesome to show in full. At least 107 people were killed, more than 200 injured, saudi authorities say. Men in bloodied robes, stunned simply to have survived. The mosque is surrounded by giant construction cranes. A powerful storm apparently caused the collapse. Mecca had been hit by high winds and heavy rains. A view from above shows the base of the huge crane toppled. Emergency workers flooding the area, carrying away the dead. They died on a holy day in a holy place, one believer said on twitter. A martyrs death, said another. Mecca is just days away from a huge influx of visitors. The hajj pilgrimage. One of the largest religious gatherings in the world. Last year 2 Million People attended. Security forces surround the area to keep it safe. But apparently what happened today was a terrible and terrifying accident, killing people who were simply here to praise god. Keir simmons, nbc news, london. All week weve been seeing heartbreaking images out of europe. Desperate refugees fleeing the war in syria, seeking a better life. The numbers are staggering. Hundreds of thousands of people on the move. But every single family, every single child has a story to tell. Our chief Foreign CorrespondentRichard Engel reports now from hungary. Reporter carrying what little they can, a generation of syrian children is wandering through europe in search of a home. On the train tracks between serbia and hungary today we saw 4yearold diana. Her mother, rawa, a christian from damascus, tells us she left syria so diana could have some hope of a future. And how many days have you been on the road, traveling . 15 days. Reporter 15 days . Yes. Reporter and where have you been sleeping . On the streets. Reporter youve been sleeping on the streets . Yes. Yes. Yes. Reporter in the cold and in the rain . Yes. Yes. Reporter and is it okay . Has she gotten sick . Or is she no. Shes sick. Reporter volunteers gave diana food and water but no medical care. I asked diana if shes tired. Yes, from the rain and walking, she says. When she last slept in a bed . Long, long ago, she says. The Hungarian Police want the migrants to board a bus to be taken to a detention camp. While diana plays, her mother joins other grownups to decide whether to get on the bus or try to run away. If they run, theyll likely be chased by police, and rawa knows they wont get very far. If they get on the bus, theyll be taken to a camp, perhaps put in a cage at the mercy of the hungarian authorities. A video of one camp shows police throwing food like feeding animals in a pen. But diana has a fever and rawa is in no condition to run. So they get on the bus, which takes them to a fencedoff camp. A generation of syrian children made homeless by war is landing on europes shore every day. No one knows how many will ever find a home here. Richard engel, nbc news, roszke, hungary. Late word tonight in the race for president. Rick perry is suspending his campaign. The former Texas Governor has been struggling in the polls and failed to build much momentum for his second bid for the white house. And while the crowded gop field just shrank by one, there is much buzz tonight about whether the democratic field will grow. After Vice President joe biden gave his most emotional remarks yet about whether he will run. Nbcs Peter Alexander has more. Youre better than i am. Reporter joe biden riding a wave of emotion, today observing 9 11 with First Responders in new york. We always rise up as a nation. We always ride on. Reporter last night on the late show again confessing doubts about whether he has the heart for another president ial bid. Nobody has a right in my view to seek that office unless theyre willing to give it 110 of who they are. Id be lying if i said that i knew i was there. Reporter biden still grieving the loss of his son beau to brain cancer. He said, dad, i know how much you love me. So youve got to promise me somethin promise me youre going to be all right. Reporter even as sympathy and support for a 2016 run grows. [ audience chanting joe ] be careful what you wish for. Reporter Hillary Clintons lead is shrinking with both Bernie Sanders and biden gaining steam. A new National Poll shows clinton beats her republican rivals including donald trump and jeb bush. Ben carson, whos quietly surging, today met with Community Leaders in ferguson, missouri. We need to deemphasize race, and we need to emphasize respect. Reporter in a race already marked by surprises, in iowa scott walkers now dropped to tenth place after leading the field just a few months ago. Trump and carson on top today. The billionaire joining the latenight circuit with jimmy fallon tonight. Another shakeup. Carly fiorina will join the toptier candidates at next wednesdays republican debate. Today taking a jab at trump. In the world i come from talk is cheap and actions speak louder than words. Reporter with rick perry bowing out its worth noting that he was the frontrunner this time four years ago before a bad debate performance, emphasizing just how much is at stake for these republicans heading into next weeks debate. Kate . How quickly things can change. Peter alexander reporting tonight, thank you. Now to that epic upset that stunned millions of viewers across the country, bringing a lot of offices to a stop including our own newsroom during those final thrilling moments at the u. S. Open. Serena williams poised to make history. Instead bowing out to an opponent most people thought didnt stand a chance against arguably the greatest player of all time. Nbcs Kristen Dahlgren reports. Reporter for more than two hours an emotional williams battled to hang on to history. The world number 1 just two games away from winning the calendar grand slam. All four majors in the same year. But roberta vinci, a 32yearold from italy ranked just 43 in the world, had other plans. I dont want to talk about how disappointing it is for me. If you have any other questions im open for that. Reporter williams wouldnt say the pressure got to her. I told you guys i dont feel pressure, ive never felt pressure. And i think i dont know. Ive never felt that pressure to win here. I think she played literally out of her mind. Reporter vinci has never won a set in the four times theyve played. Its amazing. Its like a dream. Reporter for williams it was an exhausting week. She battled her sister venus on tuesday. After that match she admitted to being tired. I have to wake up early to practice, and i dont want to answer any of these questions and you guys keep asking me the same questions. Its not really youre not making it super enjoyable. Reporter for the crowds inside and outside Arthur Ashe Stadium today every point seemed to come with heart palpitations. The end brought mostly heartache. Im really disappointed. I felt like it was her game to win. Reporter but like serena herself i won four in a row. So pretty good. Reporter fans try to focus on what she has done. Winning the socalled serena slam. Four majors in a row. Just not the same calendar year. Shes still the champion in my heart. I love her. We love her, serena reporter the reality out here, though, kate, is that ticket prices for tomorrows final are plummeting. Tickets that were selling for 1400 before todays match now going for less than half of that. Ooh. Kristen dahlgren at the u. S. Open tonight. Still ahead, lifesaving new information about bringing down Blood Pressure and preventing heart attacks and strokes. What doctors have discovered. The results so exciting they ended a major study early just to get the word out. Also our first look at the Surveillance Video of tennis star james blake tackled to the ground by an Undercover Police officer. A case of mistaken identity that has sparked an uproar. There is Important Health news tonight that doctors are describing as a potential game changer in the way 80 million americans with high Blood Pressure are treated. The National Institutes of health said today that more aggressively lowering target Blood Pressure would cut the death rate by a staggering 25 . Nbcs tom costello has details. Reporter its a significant contributor to two leading causes of death heart attacks and strokes. As many as 1 in 3 adults has high Blood Pressure. The systolic, or top number in the b. P. Measures the pressure on the blood vessels when the heart contracts. Up until now the target for anyone 50 and older was 140 or less. But todays Study Suggests getting that number below 120 could cut the risk of death by 25 and cut by a third the risk of cardiovascular events, heart attacks, Heart Failure and stroke. Researchers say it will change the way doctors treat hypertension. This is huge. I mean, 25 less deaths and a third you know, 33 less heart attacks, strokes, and Heart Failure . Thats huge. You dont get that lowering cholesterol. Reporter at Brigham Womens hospital in boston jim mcgrath was seeing his doc today. With medication his bp has gone from 150 to 130. Now it may need to go even lower. Weve had a history in our family of having high Blood Pressure. Nothing that would be critical or possibly terminal but you never know. Reporter in the federal study some people required two or more prescriptions to get their Blood Pressures down to 120. And Blood Pressure meds, especially in some senior citizens, can make them feel dizzy or lightheaded and cause them to fall. Still, doctors say this Study Suggests the benefits may far outweigh the risks. Weve previously been a little bit more lax on controlling Blood Pressure, but this study shows that we have to get peoples Blood Pressure back to normal, and that will help them live longer. Reporter still, tonight researchers say patients should not change their current medication levels without First Talking to their doctor. Tom costello, nbc news, washington. Were back in a moment with the violent videotape that had the nypd apologizing to a former tennis star. For the first time tonight were seeing the moment an undercover cop wrongfully took down tennis star james blake. Late today the new York City PoliceDepartment Released the Surveillance Video of the violent takedown a day after the commissioner apologized to blake. We get more tonight from nbcs rehema ellis. Reporter tennis star james blake is outside a hotel texting when suddenly a plainclothes officer approaches and tackles him to the ground. The hotel Surveillance Video, released late today by the nypd, shows blake is arrested and handcuffed. It shouldnt have happened. Reporter blake says Police Used Excessive force. Police say this was a case of mistaken identity. But the commissioner is investigating. Was the force used appropriate . And the initial review we believe that it may not have been. Reporter police and the mayor have apologized to blake. Today blake responded, saying extending courtesy to a public figure mistreated by police is not enough. I am determined to use my voice to turn this unfortunate incident into a catalyst for change. James frascatore, the undercover officer, have had two previous Excessive Force lawsuits filed against him. Hes on modified duty. Now the 59 seconds of video for everyone to see, a critical element in this case. Rehema ellis, nbc news, new york. When we come back, never forget. 14 years since the day that changed everything. Take vo were following breaking news outside sacramento a wildfire is threatening an entire town. Hundreds of homes. Jess take vo plus the Instagram Video causing controvery for San Francisco police. Next close the news is next. None of us will ever forget where we were on this day in 2001 as the worst terrorist attack in the u. S. Unfolded before our eyes. 14 years have passed since the events of 9 11, and today people all over the country paused to remember the nearly 3,000 lives lost. [ bells chiming ] every year we hear the names read out loud and it never gets any easier. Steven paul chucknick. Reporter connor gavagans father worked for cantor fitzgerald. We first told his story when he was born, one month after 9 11. Now hes 14 years old. If i were to have one wish in this world, it would be to meet my dad. Although i never met him, from what i have heard he was a great man. Reporter and in shanksville, pennsylvania theres a new ritual this year with the opening of a brandnew memorial, a wall of photos as the centerpiece, 40 feet high, one foot for every life lost. Our own pentagon correspondent Jim Miklaszewski was invited to speak, struggling as he recalled being at the pentagon 14 years ago today. It became a makeshift morgue. Reporter he honored the men and women on flight 93 who stopped their plane from hitting the nations capital. While all of us were writing only the first page of 9 11 history, the 40 on flight 93 were writing their enduring legacy. Reporter ed roots cousin lorraine bay was the senior Flight Attendant on board. The wounds never completely heal. We go on, we adapt, we do the best we can. Reporter for some it was a day of service, a day to pause and reflect in silence. 14 years have passed. It seems like yesterday. America will never forget. And that is nightly news on this september 11th. Im kate snow in for lester. For all of us at nbc news, thank you for watching. Have a good night. We begin with breaking news just southeast of sacaremnto. This is esentially gold country. A wildfire that breaking news is southeast of sacramento, gold country. A wildfire there raging out of control. It has grown exponentially in just the last few hours. About an hour ago mandatory evacuations were lifted for san andreas. People were told to be ready to get out if necessary again. The governor has declared a state of emergency for this area. It is hot, it is dangerous. And that entire area has about 6,000 homes that at one point or another have been threatened by this fire. At this point it is only 10 contained. Earlier this afternoon it started to explode and move in every direction, motivated by the wind. Of course were going to continue to monitor the situation here. Good evening, everyone. Im jessica aguirre. For the First Time Ever publicly, one of the seven students who survived that balcony collapse in berkeley is sharing his story. The group of friends hanging out on their balcony when suddenly it fell, killing six. Today neil murray spoke to reporters outside t