A new and effective ways for Police Officers to deal with stress, meditation becoming part of the job. And home on the range. A treasured symbol of america and the people working to make sure they still roam. Announcer this is nbc nightly news with kate snow. Good evening. It was supposed to be a joyous occasion, a College Party to celebrate homecoming weekend after the Clemson University tigers scored a big win, but just after midnight cheers abruptly turned to screams at an apartment complex in south carolina, dramatic cell phone video shows people dancing at the offcampus party when the floor gives way sending them into a free fall leaving people piled on top of each other. Dozens were injured, and tonight survivors are sharing their harrowing stories from those terrifying moments. Tammy leitner starts us off from south carolina. Reporter celebration turning into chaos in just seconds at this homecoming party. When the floor suddenly collapses. The floor broke. Reporter sending dozens of people plummeting several feet down into the basement. The whole piece, i saw that fall on a girl . Ricardo arroyo shot this horrific video, bodies piled on top of each other, some desperately trying to climb out, others too stunned or injured to move. A lot of students in pain, a lot of bloodshed. I saw a lot of open wounds, not something we anticipate seeing at a meter. Reporter the floor gave way after dancing revelers began jump is at the same time. 30 people were left injured, some taken to the hospital, including tyrese blocker whose knee was stitched up. I felt the floor give in, but by the time i felt it it was too late. Reporter the Kappa Alpha Phi hosted the party at a private clubhouse about three miles away in Clemson University. This is not atypical for an organization to have an event at a facility such as this. Strike and a catch. Reporter the party coming hours after the Clemson Tigers big win against north carolina. Hundreds of partygoers packed into the room. For some lucky to be alive. It was a crazy moment. Ill never forget it for sure. We reached out to the fraternity to find out what exactly happened inside here, but we havent heard back. Meanwhile, police are investigating. Kate . Tammy leitner down there, thank you. A manhunt is under way in georgia for a teenage suspect wanted in the killing of a Police Officer this weekend. Officer antoine tony was shot in snellville, georgia, east of atlanta while check out a suspicious vehicle near the school near a school. One suspect was captured. Another got away. Officer tony later died at a hospital. He was just 30 years old and just days away from marking his third anniversary on the force. New developments tonight with the Migrant Caravan thats been getting a lot of attention this weekend. House thousands of people have crossed from guatemala into mexico with many hoping to make it into the United States where President Trump is making it a political issue heading into the Midterm Elections. Gabe gutierrez reports tonight from the city of tapachula in southern mexico. Reporter tonight the Migrant Caravan is growing. The group fleeing violence and poverty in Central America has pushed through mexicos southern border and many mexicans are joining in as they move north. Reporter this is now a massive exodus of around 7,000 people, and they are making their way to tapachula, the most important city here in the southern part of a country. Its a critical juncture for this caravan. Its where the prior caravan reorganized to move north to the United States. Translator were going to keep moving forward, this man says. Hes been traveling for monthan a week with his 2yearold daughter. Unlike fridays clash at the border, now the Mexican Government says it wont use force to stop migrants. Here on the guatemalan side of the border patience is wearing thin. Rather than wait in this line to apply for Refugee Status in the heat, some desperate migrants have decided to cross into mexico illegally. We met this woman gilma as she climbed on to a rost hoping to eventually reach the u. S. She doesnt believe applying for Refugee Status will work and shes afraid to return to honduras. We live in a terrible situation in our country, she tells, telling us her son was beaten by the military. But others are turning around, boarding buses back to honduras. Has it been very hard . Rosa made the gutwrenching decision because of her 4monthold doubt ir. For her there was too much at risk. Tonight many migrants have gathered in the rain at this park in southern mexico. The government is urging them to head to shelters and apply to stay in this country, but many here say that they plan to continue marching north towards the u. S. Tomorrow. Kate . Gabe gutierrez in mexico for us, gabe, thank you. Saudi arabia issued new denials today in the killing of Washington Post columnist Jamal Khashoggi as new security pictures were released of khashoggi before he entered the saudi consulate in istanbul. The Saudi Foreign minister again denied in an interview with fox news that any of those involved had ties to crown Prince Mohammed bin salman. This was an operation that was a rogue operation. This was an operation where individuals ended up exseeding the authorities and responsibilities they had. They made the mistake when they killed Jamal Khashoggi in the consulate and they tried to cover up for. The foreign minister also offered his condolences to khashoggis family. A desperate search for survivors sun folding tonight in taiwan where a highspeed passenger train derailed killing at least 18 people, injuring more than 170. We get details tonight from nbc tonight. Reporter the deadly aftermath of a deadly train wreck in northern taiwan. This aerial footage revealing the scale of disaster, a zigzag of twisted metal and flashlights being used to scour for survivors. Some of the victims were crushed to death. The injured were rushed to nearby hospitals as desperate families checked white boards for updates. The express train was carrying more than 360 passengers from a suburb in taipei towards a city on taiwans east coast when it suddenly derailed. Capable of handling 93mileperhour speeds, this was one of taiwans newer and faster trains on a route popular with tourists. Taiwans president tweeting todays accident is a major tragedy. Authorities tonight have launched an investigation into what caused taiwans worst rail disaster in more than three decades. There is new friction with russia tonight over nuclear weapons, and now President Trump is threatening to pull out of a landmark arms agreement that was negotiated decades ago marking a turning point in the cold war then. White house correspondent Kelly Odonnell has more. Reporter this demonstration of putins arsenal ratcheting up tensions with the u. S. President trump says he is ready to act, withdrawing from an historic Nuclear Missile treaty. Russia has not, unfortunately, honored the agreement, so were going to terminate the agreement. Were going to pull out. Reporter tonight National Security adviser john bolton is in moscow to deliver the message. We still have issues and disagreement. Reporter more than 30 years ago, a legacy achievement for president reagan and the soviet unions Mikhail Gorbachev who sign the intermediate range Nuclear Forces treaty or int that eliminated groundlaunch Nuclear Missiles that could travel about 3,500 miles of, but under Vladimir Putin something changed. Nato says flatly russia is in violation of the inf treaty. But in helsinki in july putin complained about u. S. Missile launchers positioned in europe calling that a dangerous situation. Former acting cia director John Mclaughlin sees risk in the president s decision. This is one of the few channels of communication we have with russia on serious matters at a time when our overall relationship with russia is not very good. The Senate Foreign relations chairman says the president could be testing putin. So this could be something thats just a precursor to try to get russia to come into compliance. Reporter but senator rand paul is worried. I dont want to see another nuclear arms was russia or with any other country. Reporter white house Officials Say they expect another oneonone meeting between President Trump and Vladimir Putin sometime in the next few months, but nothing is set in stone. These conversations begin tomorrow, and then both leaders are going to paris in just three weeks for a major celebration marking 100 years since the end of world war i. Kate . Kelly odonnell at the white house, kelly, thank you. As the miss trmd elections approach many campaigns run folding on social media in realtime. On friday a new caution about that as federal prosecutors accused a russia woman of orchestrating posts aimed at meddling in the elections so what are the Major Social Media Companies doing to stop that kind of activity . Nbcs jo ling kent went inside the war room to find out. The drive to protect the Midterm Election is in high gear at facebook. Welcome to the war room. Thank snow the worlds Biggest Social Network is mounting a coordinated war against false news and hacking in the final two weeks before election day. We want to be as quick and agile as we can here. All of these things help us really prevent problems before they can become viral. Russia, russia, russia. Reporter the hope to prevent another 2016 disaster when the company allowed meddling and fake information to fred. We were slow in identifying the russian meddling operations in 2016. Reporter facebook claims the investment is paying off, saying its found accounts from russia, iran and inside the u. S. Targeting users in recent months. Reddit, another powerful social network, is in the fight, too. Is reddit ready for the mid terms . I think so. I think so. Reporter reddit is a breeding ground for conspiracy theories, violent threats and racism that unfold in real life, like the charlottesville unite the right rally last year, making its efforts even more critical. Weve spun off a couple of teams this year specifically to work on this problem, on the data side and engineering side to find people, whether its statesponsored or not, attempting to manipulate reddit. Reporter they ceo said they found 1,000 questionable russian accounts but facebooks recently departed Security Officer alex stamos says winning will require more government operation. The United States could do better. The issue is we have organized foreign groups whose entire desire is to mess with the election. Reporter an uphill battle to protect your vote online and off. Jo ling kent, menlo park, california. Substance abuse and particularly opioid abuse has touched people in every corner of this country, we know that, but tonight we want to focus on the Orthodox Jewish community where historically the stigma around talking about Substance Abuse kept people from getting help. As part of our series one nation overdosed we looked at how thats now changing. Its a busy morning from this rabbi and his wife aviva. Did you get your scissor . Getting their four kids ready for school. What time is school today . Ive had parents come to me at certain times say your kid came in class talking about someone who overdosed. Reporter thats because he isnt just a rabbi and a dad. Have a great day, everybody. Reporter hes the guy people turn to with personal struggles. Hes constantly on the move running from meeting to meet, a phone glued to his ear, a bridge between the tight knit or the dockets Jewish Community and the resources they need to tackle Substance Abuse. Why is it hard to get people to talk about Substance Abuse in the Orthodox Jewish community . Its hard in any insular community, not just unique to the Orthodox Jewish community, the belief if we keep everybody sheltered they will keep themselves immune from the outside world. Reporter four years ago he battled the stigma sounding addiction. He pull nod punches with a series of startling videos. I thought when i put out the first one that i would be ostracized. Reporter and were you . Not at all. I will tell you all the volume that came in after that video came out was insanely large. Reporter another signature of his approach, awareness events, drawing standing room only crowds, he often invites families who struggles with Substance Abuse to speak. If we can help one person, that is nobrainer. I think its a struggle both on, you know, the religious level and the personal level, and its all kind of intertwined. Reporter leanne and etl foreman raised their five kids in the Orthodox Community in teaneck community, they were stunned when their eldest daughter ellie revealed she was using drugs for years. The Orthodox Jewish traditions as such felt constricting to me and they didnt feel i felt no connection to it. I was looking for whatever else there was in this life that would fill that hole that i felt. Reporter started at 13 with alcohol. By the time she was in college, she was also using marijuana is cocaine, adderall and pain killers. We realized very quickly and very early on this is a disease like any other disease. You dont choose it. It chooses you, and it chose her. Reporter eventually ellie chose recovery. Shes been clean now for a year and a half. This group has taken on more than 200 Substance Abuse cases this year. How would you describe the change over the last four years . Light years, went from everything being hushyou are under the carpet to people finally saying this is real, lets get people the help that they need. Reporter the company name means pillars and they feel like they are pillars in the community support. Coming up, how Police Officers are relieving stress with an anc Liberty Mutual accident forgiveness means they wont hike your rates over one mistake. See, Liberty Mutual doesnt hold grudges. 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Its a new tool that some admit wasnt so easy to accept at first. Joe fryar tonight on a quieter sides side of policing. Inside this Police Academy gunfire is within ear shot of the track and deep within something quieter is happening. Here officers are learning about meditation and mindfulness. Its really hard to swallow that sglil it helps, and it really is a journey over time that richard gurleying isnt just a certified trainer, hes a trainer at this Oregon Police department. I do not want to be this weirdist weirdo that bringing meditation to Police Officers, no possible way. Reporter but after seeing what a difference meditation made in his life he started thinking about how it could help other officers especially with so many accusations of Excessive Force and growing tensions within Police Departments in communities of color. Were paying attention of whats happening when we think of somebody we have conflict with. Reporter in 2012 he launched the Mindful Badge Initiative teaching mindfulness across the country. With this you hope to see fewer instances of this unnecessary or excessive use of force . Im hopeful well she. Reporter researchers at Pacific University in oregon have seen improvements in officer stress and decreases in burnout. We also found that officers reported less aggression after eight weeks of this training, that they were less likely to inflict physical harm and have anger outburst. Reporter lapd officer Aaron Thompson now tries to meditate daily. I think about learning about selfawareness and about compassion. It really helps the relationship between and the trust between the community and the police. It can bridge that gap. Reporter these officers say it wont fix everything, but mindfulness can be a useful tool for a stressful job. Joe fryar, nbc news, los angeles. So interesting. 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His office is his saddle. Were about 1,350 head roughly this year, so our capacity is just under 1,500, and weve been growing the herd to that. Reporter in a tradition dating back half a century, cowboys and girls have braved chilly mornings to suit up, round em up and bring em in. Trying to convince a 2,000pound animal to go where you want it to go isnt easy. Levi olver is a Third Generation rider here. Its an adrenaline rush. Working cows is nothing like pushing buffalo. They push back. Reporter thousands of spectators around the world come to savor the old west, and as they hurtle through the picture postcard of the black hills, there is a purpose. Watch that gap. The bison are coming in for their annual checkup. And melissa killson wouldnt miss it for the world. Seeing the bison herd just moving as one, i mean, its majestic. Reporter they are given the once over for disease, pregnancy tested. The little ones are branded and others chosen for sale. It does serve a purpose for herd management, but its its a thrill ride lout there. Nothing beats chasing the buffalo across the prayery. Melissa and husband Mark Hendricks are living and reliving american history. Being here in south dakota and working with the bison here in Custer State Park is definitely my part of the american dream, yes. And alltime roundup for the ages to ensure the buffalo roam forever. Kevin ticketbbles, Custer State Park, south dakota. Thanks it for nightly news. Lester holt will be back here tomorrow. For all of us here at nbc news, have a great night. Nbc sports, home of the olympic games, the nhl, the nascar playoffs, notre dame football and number one show sunday night football. Only on nbc. Sunday night football everybody watches what an atmosphere in kansas city. Im in the sweet spot im feeling good the sun is shining i knew it would the worlds a playground im in the clouds let me show you what its all about in the check it out