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i tart with fueln it. almost 200 gallons of fl >> flight 17 t ok from amsterda noon local n i way to . the planroednt iukraine, nearing border. that's when s terribly wrong. >> whaablyhappened, this crew was fly along on auto pilot, in the middle of theday, of that aircraft and all t d oud tonight the u.s. beliesexplion was caedy aine blown outsky.t down, not accint >> they wouldn't have had a chance to outmaneuver it, once the missile impacted the aircraft, that flight was >> reporter: it's unclear who filed the missile, but7 did fly over a war zone.

confli bwe the russians and the ukrainians. >> it's hard to understands why you would route an aircraft over a known combat zone. >> but the plane's altitude was determined to be safe for commercial air traffic, even though nato's top commander philip breed love said recently that russia has been providing air defense training to the pro-russian rebels. >> why this malaysian flight did not file to go left or right and not over the combat zone is still a mystery tonight.ndor photogra abc news freelance produceroh wl was one of the first journtsat ing the scene to george stephanopoulos you're at the crh e. >> it's a ptty rote country road and there are rebel fighters here who hav seecured . there's a smouldering pile of w.

i'm trying to headre right now.e s touring the wreckage with russian separatistdeears now in control of the region. >> who was talking to you there? >> sorry, a weapon. jt pointed out with a hlflasighte groundha th--e' there's blood splattwhe and pieces of --ie pces of remains-, eyeni s fli out intoie the now. there are bods stt erywhere. lig woman, just a low. iging for s febr pro-ruave wstn tro create, easternarea ofukraie

with russia.t not onlyn just this wet' bie o uai military est mh17 w a com flight, filled withcivilian not aartarget. ukrainian russia, which aused of arming the separatists.saying, r a saster, but anctf terrorism. is intercepted phonewhat ey dving in the recordings, cribe as militants talk about shooting down a plane. laterg it was a civilian >> i cmagine anybody on eith side of ts conic

ing to take down a malaysian aircraft. it was not an accident that ty were trying to s a aira wrong aircraft. pro-russian militants deny they are responsible. >> soetr it was the russians or the rebels omedy el radar-guidedsa.-11sile up to 33,000 feet, which impacted this airliner and brought down,ilng allaboard. was used to shootnpowerful mis plane. this w not just some all syem this was a very sophisticated surface-le>> a system that requs ough.sive training andhofid it >> perhaps whaed is th the rebels knew ju e to missiles, but not eno tugh ircraf ntiate between a military aircraft. >> today president obama offered his condolences to the families

of the victims. >> the united states will offer any assistance we can to help determine what happened and why. and as a country, our thoughts and prayers are with all t families of pa er call home.s the victims gatheredamsterdam's intenal airport and across e rl in kuala lumpur, the flight's final for thpe maysia, it's another devastatng less fhs after malaysia air 370 disappeared over the ind ocean. >> it's a t cncidence for the peoplef malaysia and for malaysian airlines. that the aircraft tha was down tay mal air model as disad earlier ythat w still don't staggering closecalls. pit ofour stomach.g in

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today's disaster in the air was one of the deadliest ever. but if as the u.s. government now believes, the malaysian airline flight was hit by a missile, it wouldn't be the first time a commercial airliner was shot out of the sky. what do past incidents tell us about what may have happened here? here's jim avila. >> a debris field stretching for miles, the fuselage from the frame to the human body, decimated. a few miles away, entire, in-tact chunks, still carrying the airline's color scheme. body, still recognizable in a rez dreshl neighborhood. the voice recorder on board which tapes the conversations, are unlikely to have recorded

more than an explosion. the captain and first officer would not have seen a speeding missile coming their way. and the passengers never knew what hit them. >> at 33,000 feet, you'll be possessed of only a couple seconds before you black out. even if the stunning effect of whatever explosion of whatever occurred hadn't already knocked you out. >> on the ground, everywhere you turn, clues of what brought this plane down from 33,000 feet. >> when you see wreckage and people still strapped in their seats, along a path of five, ten miles, like we have here, it indicates the airplane most definitely split up at higher altitude, and dumped not only people out, but dumped the entire section of the fuselage, and that's indicative of an explosion. he says because so many of the pieces show no evidence of fire, that indicates an explosion from an outside source.

where it happened, points to a missile. >> this is a war zone and people are firing at each other. it is possible for somebody to mistake an airliner, even at 33,000 feet, for a hostile airplane. it's happened before, at least twice. >> in both cases, the civilians planes were somehow seen as threats to the country that shot them down. >> that was dead on. >> on july 3rd, 1988, an iran yane airliner with 290 people on board from tehran to dubai, when it was shot down over the persian gulf, by a missile fired from a u.s. navy ship. the us had been exchanging gunfire and mistakenly took the air 330 airbus for an iranian fighter jet. five years before that, in september 1983, a korean passenger plane, with 269 on board was shot down by a russian fighter jet after it accidentally strayed into then

soviet airspace. the soviet government first denied involvement. >> let us now listen to the tapes. >> but at the u.n. security council, audio tapes made it clear, it was a deliberate act. >> in both of those cases, there had been something else going on in the area the day before. in the ukrainian case, something was shot down the day before. so it's possible that people on both sides of the border, russia and ukraine, were seeing it through the lens of the continuing activity that's been going on on that border and thinking, this was not a passenger plane, but thinking it was a military plane. >> in this case, denial is possible again. the ethnic russian opposition controls the ukrainian land where the plane crashed. and the rebels claimed to have already confiscated those

crucial black boxes, vowing to send them to russia, former ntsb director tom houder tells us, the data inside them cannot be altered without detection. >> it's very easy to tell if somebody has tampered with that data. so i'm not overly concerned about that. the key now is to get that data to the authorities as quickly as possible. get the specialists on hand and download the information. >> perhaps of more concern is the integrity of the crash site itself. in a war zone, maintaining a crime scene is not always the first priority. >> that's a major concern. any time you have an uncontrolled accident site, parts vanish. it's just the way it is. we don't want that to happen here. obviously, if they start removing parts, they may remove parts that are critical to the investigation. they don't know what they have. so there needs to be some control over the site. any part that walks off, if you will, may be the critical part to help understands what happened here.

>> a ten-mile debris path, with clues, answers, and the victims that carry them, now all guarded by hostiles, perhaps even the people who shot them down. for "nightline," i'm jim avila in washington. >> fbi officials will now be heading to ukraine to aid in the crash investigation. next, our team is on the scene in gaza, as israel begins a ground operation. we've got all the breaking details. nobody told us to expect it... intercourse that's painful due to menopausal changes. the problem isn't key. ...on its own. so it's time we do something about it. and there's help. premarin vaginal cream. a prescription that does what no over-the-counter product was designed to do. it provides estrogens to help rebuild vaginal tissue and make intercourse more comfortable. premarin vaginal cream treats vaginal changes due to menopause and moderate-to-severe

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