here's abc's neal karlinksky. >> the hunt is on to dissect every moment of these three possible terror suspects' lives a search that will run straight through their cell phones as law enforcement struggles to uncover their digital footprints. investigators faced the same challenge last year in paris uncovering a huge stash of disposable cell phones can activated one day before the attacks. investigators continue to struggle to unravel the iphone used by said farouk. the justice department says it may not need apple at all. and telling a judge an outside party demonstrated to the fbi this past weekend a possible method for unlocking the phone. apple has fought the government's attempts to force it to weaken iphone security so investigators can break in. >> we have a responsibility to help you protect your data and protect your privacy. >> but it's not just apple. there are a number of encrypted third party messaging apps known to be used by terrorist and law enforcement worldwide is struggling to keep pace. neal karlinksky, abc news, cupertino, california. >>> big mystery who was that t

neal karlinksky, abc news, burns, oregoning. > incredible video. >> coming up in our next half hour, a major development in the case of the so-called affluenza teen ethan couch back in the u.s. this morning after weeks on the run in mexico. what kind punishment will he face now? >> first, putting those virtual assistants to the test. siri versus core tan nab versus the one that came out on top. you're watching "world news p[music] p>> dr. charles stanley: and the pwonderful thing about god is, he pdoesn't cause us to measure up pand then choose us. pgod takes our inadequate areas pof life and he uses them to do psomething in our lives that's p[music] periscope with a new live streaming feature allowing users to broadcast video in realtime directly to friends via their social network account. as of now, it is only available for iphone users in the u.s. >>> a new hi-tech tool is proving to be invaluable to law enforcement. detection technology that uses infrared tracking to monitor eye behavior and the creator says it works more quickly and accurately than traditional methods to determ

here's abc's neal karlinksky. >> hit the jump. hit it. >> reporter: a father and son back country ski outing turning to a heart pounding fight for seconds as 5-year-old ethan goss disappears amidst the trees. he's fallen out of sight in that tree well. >> ethan? winston gaus digs his son out. the boy fighting sef indication. >> here we go. here we go. i got you. >> i need to breath. >> reporter: the video now viewed more than a million tiles online as this father us his close call 0 warn others causing it the most frightening experience he's had as a parent. >> i remember sitting there watching the video with him and my leg was shaking just a bit. it was pretty emotional afterwards. it was a true moment, know, for >> i had a near death experience. >> you never expect something like that to happen to you. but once it does it's kind of shocking. >> reporter: it's hard to see till you're up close. these branches block so much snow. one step down there you sink another six feet at least. a safety video put out by the northwest avalanc

neal karlinksky is there with the latest for us. >> reporter: el nino's fury ripping apart a chunk of the coastline. a drone video catches a huge police have yellow tagged an entire apartment building telling residents to get out while they still can. did you sleep with one eye open? >> yeah, alert. time to go. >> reporter: take a look at this. this bluff in the city of pacifica battered by rough surf and pounding rains, leaving homes and businesses in danger of falling. just imagine if this was your balcony. underneath here, and the entire coastline continues to fall away with no end in sight. this home's patio is poking out with little support. pictures from before show the dramatic difference. despite the threat, some residents refusing to leave. >> you guys will have to physically drag me out. >> reporter: despite efforts to shore up the bluff, the people here know the danger is far from over. neal karlinsky, abc, pacifica, california. >> god, it's so scary. also the home values for these now to see your house falling into the ocean. >> those are million dollar condos and apartmen

abc's neal karlinksky now on deepening mystery. >> reporter: as mysteries go, there aren't many that can match this one for being just as annoying as it is unexplained. [ screeching ] that high pitched sound, wreaking havoc on forest grove, oregon, for weeks, mainly at night, even waking people up. >> it sounds like brakes to me. the cyclical, you know, screeching of, you need to change your brakes. >> reporter: local officials have ruled out a water valve, and the nearest train track is rarely used. >> want to hear the most annoying sound in the world? [ screeching ] >> guys, guys, guys! >> reporter: unlike "dumb and dumber," this sound isn't so funny to people who live here. the fire department doesn't know what it is either. >> welcome "the x-files" back on tv again, so, here we are. >> reporter: the truth is out there, and whatever it is, it sure is loud. and baffling. [ screeching ] neal karlinsky, abc news, seattle. >> you know, yesterday our crew sort of figured it out. and our belief, i mean our crew thought it was something in the water system. >> that that's that loud out t

neal karlinksky, abc news, burns, oregoning. > incredible video. >> coming up in our next half hour, a major development in the case of the so-called affluenza teen ethan couch back in the u.s. this morning after weeks on the run in mexico. what kind punishment will he face now? >> first, putting those virtual siri versus core tan nab versus google. the one that came out on top. periscope with a new live streaming feature allowing users to broadcast video in realtime directly to friends via their social network account. as of now, it is only available for iphone users in the u.s. proving to be invaluable to law enforcement. it's called ocular based lie detection technology that uses infrared tracking to monitor eye behavior and the creator says it works more quickly and accurately than traditional methods to determine whether a person is lying during questioning. >> can you use it on your kids. >> you can use it on your hubby. >> okay. now we're talking, huh. >> it's been five years since sci-fi became science reality for most consumers when apple first bundled siri on its i phones.