our senior investigative correspondent lisa myers is with us with more on this from washington. sa, good evening. >> reporter: good evening, brian. with the country already on edge and social media having gone mainstream, all it took was 71 characters to send the stock market into free fall. it all began about 1:07 this afternoon with this tweet from the associated press. "breaking: two explosions in the white house and barack obama is injured." the message went to ap's 1.9 million twitter followers and spread like a virus. retweeted almost 5,000 times within a minute. but it was a fake. ap's account had been hacked. >> it partly explains the unusual activity in the dow. >> reporter: the dow began plunging and within three minutes dropped more than 140 points. >> you looked around the floor. you saw people running, people upset, not sure what was going on. just watching this market trade lower. >> reporter: automatic trading programs kicked in. >> human beings weren't making these trades. these were computers, algorithms designed to scan the headlines and find negative or positiv

nbc's senior investigative correspondent lisa myers has that story. >> reporter: 68-year-old caroline davis is being treated for breast cancer at the charleston cancer center in south carolina. but she recently had to start getting her infusions of a costly chemo drug called herceptin at a nearby hospital outpatient facility. >> it is the waiting when i get in, it is just not like at the cancer center. >> reporter: caroline says all the waiting at the hospital adds to her level of exhaustion. dr. charles holiday says his center had no choice, but to send some patients elsewhere for chemo when it is part of the sequester medicare cut reimbursements to doctors who administered the drugs by 2%. some private clinics are finding that harder to absorb than hospitals. >> approximately 75% of our most commonly used chemo therapeutics cost us more to administer than we're reimbursed. we can't continue to function that way. >> reporter: this clinic decided it could no longer see one-third of its 16,000 cancer patients. >> they have to ship their care somewhere for them to sereceive chemo drugs

nbc's senior investigative correspondent lisa myers is here with more. >> good morning.alking about the mega rich, the biggest, most sophisticated players on wall street. each of the top four managers earned more than $1 billion last year, but by their standards, that's only a pretty good year. today, even for the small investor, wall street is at record levels. the man at the top of the institutional investors rich list david tepper pulled in $2.2 billion by going all in last year. >> first off before you start a couple of things. we weren't up 24, we were up 30%. >> reporter: that's almost twice as much as the stock market rose overall. >> tepper was convinced there was great opportunity in u.s. equities, he made a big bet and made a lot of money. >> he's long been known as a billionaire with middle class sensibilities. not long ago he bought in $44 million home in the hamptons, tore it down and spent untold millions building a new one. number two, raymond dalio, $1.7 billion. number three, steve cohen, $1.4 billion. >> since he started sac he's returned 30% on average

we'll see how that works out, lisa myers. thank you so much. we greatly appreciate it., nbc news chief white house correspondent political director and host of the "daily rundown." chuck, do you think if a member of congress decides to put a bill on the floor that takes care of air travelers and air safety by taking money from other areas and shifting it over, do you think the white house would veto that bill? >> i don't know if it would pass, though, first, joe. this idea of hostage taking on capitol hill of an issue in order to get your way, it's become pretty popular. started, we saw it with debt ceiling. that's a high profile way that it was used by republicans on that front. i think, no, i think you have about of the 100 senators there, i think at least 40 different sequester agendas. so i don't know if this bill could get through without the whole thing being undone and then at that point you could see how dysfunction takes over and they stand in place. i agree, he signs it, not like he would veto it on this front. if we go through say six weeks and the complaints

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nbc's lisa myers is at washington's regan national airport with more on that story. lisa, good morning. >> reporter: hey, savannah. good morning. this is the third day of furloughs of air traffic controllers around the country. so far we've seen hundreds of delays, some of more than three hours in los angeles. the airlines are warning that if these furloughs continue, one out of every three travelers could face major delays or cancellations during peak travel season. delays at laguardia, newark, charlotte. the faa on monday blamed staffing and weather and says staffing challenges at regional centers led to ground delays and more spacing between flights around the country. it's the first time the public has felt the impact of across the board budget cuts from the sequester. >> it's already bad enough when they have their regular delays so i can't imagine being stuck here for three hours and not knowing what's going to be next. >> in certain places i believe cutbacks should not be happening. >> i think it's horrible. there's enough problems dealing with delays and secur

nbc's senior investigative correspondent lisa myers has that part of the story, good morning. >> mattty it's clear these days that anyone with a grievance and the will can learn how to become a terrorist simply by going online. now authorities are trying to use some of these sites to their advantage. the latest evidence bomb makers have taken their teachings to the web this online al qaeda publication posted last month, a guide to carrying out terror attacks including detailed illustrated recipes for pressure cooker bombs, the kind investigators say was used in boston. >> the internet has brought terrorism to the web. it's made it go viral. anybody can look online and find out how to make a bomb. it is a frightening development. >> a similar terrorist manual, how to make a bomb in the kitchen of your mom, was posted three years ago. prosecutors say it was used by this former muslim-american soldier who wanted to bomb a restaurant popular with soldiers at ft. hood, texas. anarchists and white supremacists have featured pressure cooker bomb formulas on their websites. >> there are descr

lisa myers, thank you very much.k to matt in new york. >> thank you. >>> it was a masters to remember. history was made last evening when adam scott won a thrilling playoff. nbc kerry sanders is still in augusta this morning. good morning to you, kerry. >> reporter: it was a young 32-year-old adam scott who won the masters. he is the first australian to take a green jacket. so as they say down under, good on you, adam. but it's what happened here on the 15th hole with tiger woods that still all anyone can talk about. tiger woods hopes to be back next year with this new controversy behind him. >> beautiful. you got to be kidding me! >> reporter: when his ball hit the flag pole and bounced into the drink the rules allow a player to drop a replacement ball where the initial shot was made. all was fine until someone watching on television phoned the rules committee to complain that tiger woods unfairly dropped his ball at least two yards from its original spot. league officials reviewed the tapes and agreed and tiger rec