From nbc news World Headquarters in new york, this is nbc nightly news with kate snow. Good evening, it was a dramatic moment thats being watched and rewatched after leaving the 9 11 kmem ration in new york this morning, Hillary Clinton stumbled, nearly collapsing. The Campaign Said she felt overheated but then late today we learned there was more to the story. Clintons doctors saying she was diagnosed with pneumonia on friday. Now renewed scrutiny of clintons health, which her opponent d donald trump tried to make an issue in this campaign. We have it all covered beginning with Kristen Welker in new york. Kristen . Kate, good evening. Secretary clintons physician examined her in her home and then released a a statement late today which reads in part, secretary clinton has been experiencing a cough related to allergies. On friday during a followhad up she was diagnosed with pneumonia. All this coming to light after todays big health scare. Reporter it start ed as a day of remembrance. Hillary clinton and donald trump arrive ing at the 9 11 memorial just after 8 00 this morning to never forget the fallen. But then an hour and a half later in an abrupt departure. Clinton leaving the ceremony early. Video surfacing on twitter showing the former secretary of state unsteady, appearing to lean on a post and requiring support getting into her van as her legs seem to buckle. The press left in the dark for about 90 minutes. The campaign giving no details about where clinton was going or what happened. Just after 11 00 a. M. , the Campaign Said in part, Hillary Clinton felt overheated during the ceremony and departed to her daughter chelseas apartment, which is just a a few miles away. Then just before noon, clinton emerged unassisted, smiling. Its a Beautiful Day in new york. Saying she felt much better. Are you feeling better . Yes, thank you very much. Clinton even stopping to greet a child before getting into her van and heading back to her home and husband bill. Clinton supporter and congressman joe crowley also attended the memorial and said she seemed perfectly normal. I was standing just behind Hillary Clinton and it was very hot. Er her pneumonia diagnosis was announced. It can be beaten quickly if treated properly. If shes hydrated now and taking medications shes supposed to be, she should be good to go. The Clinton Campaign says the former secretary of state does not travel with a physician. Law enforcement sources say most agents receive extensive emt training and can assist in an emergency and theres always supposed to be a first aid kit in a motorcade. Still this video is raising serious questions about the democratic nominees health just as the final fall sprint is getting underway. Clintons physician has put her on antibiotics and says shes recovering nicely, but she has encouraged her to rest and scale back her schedule. Hillary clinton is is clj scheduled o to go to california starting tomorrow, but now that trip is in question. Kristen, thank you. Although her doctor said shes in excellent health, there have been concerns about clintons medical history even before today. Back in 201 when she suffered a concussion and had a blood clot. No doubt the health of the candidates will become a bigger issue. Andrea mitchell has more on that tonight. Reporter Hillary Clinton showing no sign of a Health Problem during a busy campaign week. Except for what her doctors at the time called seasonal allergies on labor day. 15 months ago a twopage medical report detailing her most Serious Health issue. Her doctor writing in december of 2012 mrs. Clinton suffered a stomach virus after traveling, became dehydrated, fainted and sustained a concussion. She was hospital liezed, doctors finding a a blood clot requiring bloodthinning medication chrks she still takes. And and special glasses when testifying about benghazi. Its wonderful to see you. Good health and as combative as ever. Clinton had a clot in her leg. You had at least two clots. How does that factor into a decision about whether to run for president and all the flying that that entails . It doesnt factor in at all. I have no doubt that im healthy enough. Donald trump has ewed that to claim clinton is hide iing a serious Health Problem. She also lacks the mental and physical stamina to take on isis. His latest paranoid fever dream is about my health. And all i can say is, donald, dream on. Clintons campaign struck back at Donald Trumps report. A brief letter praising Trumps Health as astonishingly excellent, extraordinary. The letter addressed to whom my concern. In a rush, i think some of those words didnt come out exactly the way they were meant. But after today clintons health is now a political issue, because after saying she only had allergies, they did not dispose her later diagnosis of pneumonia until forced to by todays event. Thank you. As you heard donald trump was at that same 9 11 event here in new york today. While he said u nothing publicly about clintons health scare, he has had a strong reaction to what clinton said about his supporters late friday. Hallie jackson has more tonight. Reporter donald trump today observing a moment of silence and staying that way so far about Hillary Clintons health scare. Not drasing it during a visit to a manhattan fire house. Trump also quiet about whats now become another political headline. The partial apology from clinton after these comments at a fundraiser friday night. You can put half of trumps supporters into what i call the basket of deplorables. The racist, sexist, homophob homophobic, islam phobic, you name it. Trump calling that so insulting adding, what a terrible thing she said about so many great americans. Those are deliberate statement on her part. She wants to pick a fight. As her remarks ricochetted about social media, clinton walked them back somewhat saying she regrets the number of people she labeled deplorable, but not apologizing for the label itself. I dont think anyone denies that there are people there who are deplorable. Attacks intensifying as the right gets tighter. Clinton putting two solid red states in play for the first time in a decade. And in two others, nearly dead locked. Hillary clinton with a long record and people in every state has not yet been able to pull away from donald trump, Whose Campaign has been marred by continual controversy. A new poll out today shows clinton leading trump by 5 points among likely voters, but an Enthusiasm Gap could hurt her. Its Trump Supporters who show more interest in the campaign and voting, which could play a factor in his favor when it comes to turnout. Hallie jackson in washington, thank you. Todays health scare for clinton certain to resident nay for days to come. Will it be a turning point . For more on that, were joined by chuck todd. We have less than two months until election day. Clinton may have to leave the trail for a little bit. How much impact could this have and question should the campaign have told the public on friday that she had pneumonia . Let me take the second question first, yes. 100 yes the campaign should have done that and disclosed and perhaps they didnt because they fear the innuendo campaign thats been going on on the far, far right corners of the internet. But that was a mistake. Makes it look like a coverup and only feed more questions and allows that to get mainstream. That was a mistake. I think what youre going to see over the next week is a focus on the fact that both of these candidates for president , if they are elected, would be among the oldest people to ever serve as president. Donald trump would be the oldest elected to a first term. Hillary clinton would be the second oldest. We dont have their full medical records. We know more about Hillary Clintons health than donald trump east health department. That what is going to be the focal point in the next week. More information from both of them. Chuck todd, thank you. Lets not forget this was a day to remember those who were lost in the september 11th attacks 15 years ago today with ceremonies here in new york at the pentagon and in pennsylvania. Heres a report on todays tribute. Reporter today at ground zero, a solemn tribtd. We carry your heart in our hearts, joe. The whole family misses you. Reporter among those lost, hundreds of first responders. You were never be forgotten. On nempb the nation came together. Jared was 10 when his father died in the north tower. Today he works with children of other tragedies. Sometimes the bad things that happen in our lives put us on the path we need to be going, to help others as many have helped me. P. S. , i love you, dad. Reporter at the pentagon, president obama remembered the fallen. We remember and we will never forget the nearly 3,000 beautiful lives taken from us so cruelly. Including 184 men, women and children here. Reporter and in pennsylvania, hundreds more came together. We gather today to honor the heroes of flight 93. When had the skies over this field gave their lives in order to thwart an attack on the United States capital. Reporter along with remembrance, a day of solidarity and service, thousands of volunteers packed meals for those in need. So many people just putting aside their differences and coming together for this unity that has come from something bad to help people change it. And on a personal note, i was here working on 9 11 and i can still see in my minds eye the dazed look on peoples faces covered in soot and ash. They were frightened. I was frighten ed too. The terrorists tried to topple americas spirit, but this community is more vibrant than ever. For me, one World Trade Center behind me is a sparkling symbol. Americas spirit is more alive than ever. Such a a good point, thank you. Overseas an interim ceasefire is supposed to take place in syria in a deal worked out aimed at reviving the peace process. But this weekend at least 90 people were reportedly killed in attacks on rebelheld areas of the country including the besieged city of aleppo. Tonight chief Foreign CorrespondentRichard Engel reports on how one family was a able to get out. Reporter even as he was running the gauntlet to escape whats left of his hometown of aleppo, his terrified wife and 6monthold baby beside him, this journalist kept the camera rolling, chronicling for us their desperate journey out of seyria. We were facing death at all times, he says. I thought we were going to die, says his wife. They were leaving aleppo by the syrian version of the underground railroad, a convoy of two vans driven by brave volunteers. They drive fast because this is a kill zone. There are charred bodies in some of the vehicles they pass. They are taking the risk because they think if they stay in aleppo they are dead any way. Syrian Government Forces have the city under siege and are firing at the 300,000 people trapped inside. As they are making their way out, shots ring out. Their car is under fire. She tries to shield her baby. I just wanted to protect my son. I didnt care if i died. Why were they shooting at you . You were just trying to leave. Translator the regime wanthouse to stay in the city and die in the shelling. They dont consider us as civilians. Reporter they made it out of aleppo and smugglers helped to sneak them across the border. This family is among the fortunate few who managed to escape aleppo and make their way here to the relative safety of turkey. But now they are destitute in a foreign country. They dont know if they can afford the rent on their small apartment. These are your pictures. Its full of haunting pictures he took of his beloved city of aleppo. Leaving it was a a heartbreak for him because theres no telling when, if ever, he will be able to take his baby back to aleppo or what will be left of it then. Richard engel, nbc news, turkey. Still ahead, an entire team takes a stand on i dont want to lie down. I refuse to lie down. Why suffer . Stand up to chronic migraine. With botox®. Botox® is the only treatment for chronic migraine shown to actually prevent headaches and migraines before they even start. Botox® is for adults with chronic migraine, 15 or more headache days a month each lasting 4 hours or more. Its injected by a doctor once every 12 weeks. And is covered by most insurance. Effects of botox® may spread hours to weeks after injection, causing serious symptoms. Alert your doctor right away, as difficulty swallowing, speaking, breathing, eye problems, or muscle weakness can be signs of a lifethreatening condition. Side effects may include allergic reactions, neck and injection site pain, fatigue, and headache. 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Most noticeably at the seahawks where members of the both teams took a stand in different ways. Steve patterson has our report from seattle. They stood together as one during the national anthem. All 53 Seattle Sea Hawk players arms locked in a show of solidarity. Doug baldwin tweeting as a team we have chosen to stand and interlock arms in unity. Pete carroll was proud. They want to make sense of how they can have impact and affect others. Reporter across the field four Miami Dolphins took a e knee. The chiefs interlocked arm the controversy started preseason when quarterback Colin Kaepernick refused to stand during the anthem protesting Police Brutality and racial injustice. The move drew both outrage and admiration. Some kaepernick jerseys were burned and others became best sellers. I think when our players speak out and feel strongly and passionate about something, its a good thing for us. Megan repeno and Brandon Marshal and jeremy lane and members of a High School Football team in new jersey all making their statements. But usa world cup hock e key coach is not a fan saying, quote, if any of my players sit on the bench for the national anthem, they will sit there for the rest of the game. Fletcher played eight seasons in the nfl and says the controversy is striking a nerve. Now our athletes are bringing real life into our recreation space. I think as a community, that makes us uncomfortable. And on this Opening Sunday september 11th, players taking a moment to pause to honor freedom while attempting to raise awareness. Steve patterson, nbc news, seattle. Up next, military honors for a good dog up next, military honors for a good dog that served hi mom. Grandma oh joey run and get a cookie, ok . Let me see it today. This is what it can be like to have shingles. A painful blistering rash. Oh mom. If you had chickenpox the shingles virus is already inside you. 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