#syriahoax, trying to shift blame for the deadly gas attack. >> this is a new iteration of an old type of warfare. >> we're on the front lines of the new cyber cold war. inside british electronic spy headquarters where they first detected the election leaks. countering russia's attempts to weaponize fake news. >>> plus panda-monium. a ground-breaking journey into the far east wilderness. >> the wildlife, topography is amazing. >> disney nature's "born in china" taking you inside the private lives of pandas, snow leopards, and a pack of other exotic animals. >>> and pecking at the record. how a plea for free chicken nuggets from wendy's from a 16-year-old boy could wind up breaking ellen degeneris' record for retweets. but first the "nightline 5." >> i'm joy bauer. i know probiotics can often help. digestive advantage, tougher than your stomach's harsh environment so it survives 100 times better than the leading probiotic. >> also in chocolate, probiotic bites. >>> no wonder you can't sleep, your car is a mess. you need parts i've never heard of. it's going to cost you a fortune. >> whe

that night, a cyber-operation with the #syriahoax, pushed by the russians, became the number one trending topic on twitter in the u.s. >> it was picked up by russian influencers online who pushed the story and the hashtag until it entered the alt-right community in the united states. >> reporter: the disinformation is believed to be coming from the same secretive russian intelligence operation that last year targeted the american presidential election. >> we know that they have a large building in st. petersburg that is the home base for a team that is tasked with manipulating public opinion in other countries. >> and at this secretive british spy listening headquarters outside london, where abc news was given rare access, analysts say the russian disinformation operation has become ever more aggressive since the american election. >> it has not plateaued. it is continuing to increase. it is a very capable cyberattack operation. >> brian breaking news on another front this evening. . the british newspaper the guardian is out with an eye-opening headline, they're reporting tonight that bri

#syriahoax was twepdzing on twitter. >>> two secret service agents were fired for allowing a mace carrying intruder on to the white house grounds. it took 16 minutes to catch the man after he scaled a fence last month and made it to the rear entrance of the white house before being caught. the president was not there at the time. both of the terminated agents had been with the secret service less than two years. >>> still ahead, big plans for tesla. the new vehicles we could soon see on the road. >> plus, a senator holes his first town hall in months and he gets an earful. [ chanting ] >> the angry crowd asking the tough questions and demanding answers. >>> plus, passenger stuck on a roller coaster. how did it happen and the risky rescue high above the ground. s roller coaster. how did it hap sometimes we get a little wild at night. but i don't always finish. so i use k-y duration spray to last longer... so we can both... [[wolf howling]] [[bear roaring]] nothing brings you closer than finishing together. last longer with k-y duration. ...were comfortable,... ...they'd spend more time... .

the night it happened #syriahoax was trending on twitter here in the u.s. >>> two secret service agents have been fired for allowing a mace-carrying intruder onto the white house grounds. it took 16 minutes to catch the man after he scaled a fence there last month. he allegedly made it to the rear entrance of the white house before being caught. the president was not there at the time. both of the terminated agents had been with the secret service less than two years. >>> still ahead, big plans for tesla. the new vehicles we could soon see on the road. >>> plus, a senator holds his first town hall in months, and he gets an earful. [ chanting "shame on you" ] >> the angry crowd asking the tough questions and demanding answers. >>> plus, passengers stuck on a roller coaster. how did it happen and the risky rescue high above the ground. rescue high above the ground. s >>> senator, my question is when are you going to choose your country over your party? >> overnight a rowdy crowd confronts an arizona senator during his first town hall meeting in several months. in fact, it's the first time

#syriahoax, trying to shift blame for the deadly gas attack. >> this is a new iteration of an old typeeaponize fake news. >>> plus panda-monium. a ground-breaking journey into the far east wilderness. >> the wildlife, topography is amazing. >> disney nature's "born in china" taking you inside the private lives of pandas, snow leopards, and a pack of other exotic

that night, a cyberoperation with the #-syriahoax pushed by the russians became the number one trendingitter in the u.s. >> it was picked up by russian enforcers on line who pushed the story and the hash tag until it entered the alt right community in the united states. >> reporter: the disinformation is believed to be coming from the same secretive russian intelligence operation that last year targeted the american presidential election. >> we know that they have a large building in st. petersburg, a home base for a team tasked with manipulating public opinion in other countries. >> reporter: at this secretive british spy listening headquarters outside london where abc news was given rare access. analysts say the russian disinformation operation has become even more aggressive since the american election. >> it has the not plateaued. it is continuing to increase. it is a very capable cyber attack operation. >> reporter: in another development, abc news confirmed reports out of britain. that british intelligence services intercepted conversations between members of the trump campaign an