. >> when mark klein came out and said, "i work at at&t and the nsa is tapping into our network," that was the first time that the american public realized how far things had gone since 9/11. how much domestic surveillance there was. he raised this allegation. no one ever acknowledged that it was actually happening. it still remains an open question. but no one has ever denied it either. >> do you remember the incident in san francisco where the technician mark klein had found the room with the splitter?

it's mark klein. what does he think of snowden's notoriety? >> he is fine with it. snowden has far more proof than he does. but mark klein is instrumental in a lawsuit, using his evidence to get the courts to stop the spying program. ten years before edward snowden revealed his bombshell, that the united states government was electronically spying on people on a massive scale. >> i didn't do anything right away because i was scared. >> reporter: there was mark klein, who accused the nsa of doing the same thing. the 69-year-old says he felt relief that another person would corroborate his story, but with actual nsa documents. >> when he came, i was delighted. it was a personal vindication for what i was saying. he also revealed the programs that were vastly bigger than i understood at the time. >> reporter: as a san francisco-based at&t technician in 2003, he installed splitters that sent a copy of communications data to a secret room set up by the nsa, in his office building. >> i knew right away, that was completely illegal because they weren't doing anything selec

upstairs. >> narrator: upstairs on the seventh floor was where at&t handled internet traffic. >> what mark klein found was an infrastructure that suggested that the government was copying all traffic going through the at&t internet backbone. >> narrator: klein got hold of engineering drawings that showed the cables he had traced were going to a device called a splitter. >> the splitter is basically a glass prism. so you put a cable in there. the light beam goes in there and it's split like that. one half is going to the secret room and the other half is going to its normal, assigned destination. but it's been copied in the process. >> and this was important because if one can split the light or divert the light out of one of those networks, one can copy everyone's traffic on the network. it's kind of an unfathomable amount of information. >> the internet chops everything up into little data packets. so there's your email, your web browsing, photos you might be sending. this was a huge dragnet operation. and i was furious because i never signed up to work for the nsa. but i was in my late 50s and

mark klein says back in 2003, as he work eed as a san francisco-based at&t technician, he installed a splitter that sent a copy of communications data to a secret room on market street set up by the nsa. these were what would become known as the bush era wiretaps. wiretaps that then senator obama criticized. klein said he knew it was illegal and he kept the company documents after he retired in 2004. he told his story two years later. he says he's relieved another person could back up his story with actual government documents. >> delighted, it was an indication of what i was saying. he also revealed programs that were doing are vastly bigger than even i understood at the time. >> klein says the united states should let snowden come home. and you can see more with our interview with mark klein and extensive coverage of the nbc news interview with edward snowden on our website, nbcbayarea.com. you search the word "whistle-blower." >>> well, students and staff at a san jose high school will hold a vigil tonight to honor one of the young men killed in friday's attack near uc santa barbar

it's mark klein. what does he think of snowden's notoriety? >> he is fine with it.far more proof than he does. but mark klein is instrumental in a lawsuit, using his evidence to get the courts to stop the spying program. ten years before edward snowden revealed his bombshell, that the united states government was electronically spying on people

. >> you and see more of our interview with mark klein and extensive coverage of nbc news interview with edward snowden on our website. >>> an australian agency says the mizing malaysian jetliner is not in the area where they thought it would be. that area the southern indian ocean where crews have just wrapped up an expanded search based on the plane's possible route. now, the australian agency leading the search says the pings detected in that area were probably from a ship and not the plane's balack box. no sign of the plane since it disappeared way back in early march. crews plan to take advantage of weather as they bat alwildfire burning near yosemite. the fire started on monday and has burned down two homes and about 680 acres. evacuation orders were lifted for about 50 people. twice as many were ordered to leave when the fire broke out nearly 700 firefighters were working that fire. five of them have been hurt there. but they're going to be okay. right now the fire is 40% contained. >> which is a great improvement because a few days ago they had a tough time. >> the wind particula

. >> you can see more of our interview with mark klein and extensive coverage of the nbc news interviewh edward snow, en on our website nbcbayarea.com. search for the word whistleblower. >>> you don't have to search far to find a beautiful vista in the bay area. live look looking at san francisco in the distance. let's check the forecast with christina loren. >> you can clearly see to the top of the tow tlr. that just gives you an indication of how nice it is going to be at the coast for today. warmer than average. we're talking about the 70s for one final day. meanwhile, warmest day of the week shaping up for us here in the south bay. that sun is up and stays up until 8:23 in the evening. so, as our days get longer as we get closer to summertime, we do traditionally get warm temperatures. today that will be the case. tomorrow, those numbers crash as weak disturbance comes through the bay area. more changes on the way to your bay area weather. 55 degrees in san francisco and look at the microclimate this morning. 41 degrees right now with a beautiful clear sky over half moon bay. but ju

klein residents in the hills not far from the city. all kinds of vistas all kinds of lifestyles in this country, from anthony mason and mark strassmann.> when the woolworth skyscraper opened over a century ago it was the fallingest building in the world. now, the neo-gothic tower frank woolworthability as temple to the five and dime is about to become condos for the 1%. >> what we intent to do make these in to 34 residential, magnificent condominiums. >> ken horn is president of alchemy properties which street developing the top 30 floors. >> every single unit will have remarkable views of manhattan. there aren't that many properties in new york where the view is framed by something that's speck tack could you already as the terra cotta. >> what does the lucky customer want? >> the best kitchen. spectacular bathrooms. >> the interiors of the condos are being designed by tiera despon who is also working on the ritz hotel in paris. >> is it important for your buyers that you have in tearier designer? >> yes. many are going to know what terry is. >> what is an apartment in this building going to cost me? >> we haven't quite determined ye