Woman hiding under a table, then face to face with the shooter. How she made it out alive. And then tonight tracking terror here at home. The fbi warning for months about isis and its threat to kill americans. Asking how did this couple go undetected. From abc news, this is a special edition of world news tonight with david muir. Reporting tonight from San Bernardino, california. Good evening tonight from california. And we begin this evening with several breaking developments. The first picture of that young wife who Authorities Say turned into a killer. Her message to isis moments before the rampage. And the fbi now saying they are in fact investigating an act of terrorism. Heres that new image tonight, the young mother described by the rest of the family as a quiet housewife who spoke broken english, who then left her 6monthold baby Authorities Say the video of their shootout. The young wife firing out the back window after posting on facebook pledging her allegiance to isis. And the nursery, the baby toys, there were also shredded documents. The computer. We now know the couple destroying the hard drive and crushed cell phones found in the trash. And our new interview right here tonight with the couples family and their reaction just coming in pledging support for isis. Did they see any signs of trouble. We begin with brian ross. Reporter within moments of murdering 14 people at her husbands Holiday Office party, Tashfeen Malik went on facebook to declare her allegiance to isis. The fbi admitted today it was not aware of the key clue until late thursday when facebook executives notified them. Yes, there was a pledge of allegiance. Reporter ever since the bulletriddled getaway car, authorities have been unraveling the mystery of how and why a 29yearold mother of a baby daughter turned into a coldblooded terrorist. Malik was born in pakistan, but moved with her parents to saudi arabia at the age of four. She returned to pakistan to attend college where officials today described her as a brilliant student who wanted to be a pharmacist. Her marriage to syed farook last year came after she met him on a matrimonial website and had an Engagement Party in mecca, saudi arabia, while they were on hajj. Malik gave an address in this pakistani town when she applied for her american fiancee visa in 2014, an address abc news today discovered does not exist. And now u. S. Officials are questioning whether she was the one who radicalized her husband. Whether she influenced him or not. Influenced to an extent. But i dont know the answer. Reporter farook too was well after attending high school and college in california, he started a Masters Degree Program but did not complete it. He twice traveled to saudi arabia and pakistan in 2013 and 14, and a coworker told david muir farook came back a different man. I think when he returned, he started being more appearing more as a muslim, in the sense of a big beard. Reporter now the search is one for others who may have been involved in the biggest terror attack in the u. S. Since 9 11. And authorities are now tracking the person who bought the two highpowered assault rifles used in the attack, and then sold them or turned them over to farook. Brian joins me now from new york. Brian, the fbi today said the couple may have had direct contact with known terror suspects . Thats right, david. Fbi officials said one of the husband wife killing team was in telephone contact with other increasingly Law Enforcement officials tell abc news tonight, they believe it was the wife who was the instigator of this attack, that she radicalized her husband and led him down the road to jihad, david. So much focus on this wife tonight. Brian ross leading us off. Again, brian, thank you. We have a very rare look inside the home, so soon after the fbi was there poring through everything. Our team there where the young couple lived with their baby, we see snapshots of their secret life. The crib, stuffed animals, feet away, shredder documents destroyed. In the closet, baby shoes, and this, a can of gun cleaner. Matt was inside where authorities discovered the arsenal big enough for another attack. Matt, good evening. Reporter good evening, david. Being inside that house was disturbing. You get a sense of a life lived by ordinary parents, and deadly killers. Owner revealing the remnants of that other life. We can see a door thats been ripped in half. Tremendous mess here. Kitchen, cookware on the counter, a bottle of pepto next the sink. Overnight the fbi had turned the home over to its owner to allow property. Right there, on the coffee table, inventory list of items removed. And dozens of boxes of ammunition. Upstairs, in the babys room, diapers, open suitcases, shredded paper, and a prayer rug. So this appears to be both the nursery, you can see the crib right there, and something that doubles as an office. Clearly this station right here must have been of enormous interest to investigators. The printer here, the keyboard remains. Display as well. But, of course, the guts of the computer have been taken away by the authorities. Few shirts, those silver baby shoes. Up above, gun cleaner. Walking through this house, one of the most shocking things that you notice is the combination and juxtaposition of childrens toys, family pictures, holy books, and the other things that were left in this house, thousands of rounds of ammunition. And, of course, 12 pipe bombs. In this neighborhood, disbelief. Were you surprised when you heard that syed farook lived right here . Yes. Reporter he had an unusually large number of packaged delivered to this house. What he did to his own family, to his daughter, to our family, to the people there, no, i wont forgive him. Reporter farooks sister denied any knowledge of the couples plot. I wonder if i had called them that morning, how he was doing, inclination, maybe i could have stopped it. Reporter the family revealing that farook was different with his beard. There was nothing else that bothered him. They were aware he had guns locked up. And that she was a typical housewife, spoke broken english, and was not a pharmacist here in the u. S. When he left the baby with his mother, he said he was going to the doctor with the stomach flu. Instead, he went on that rampage. Now, the lawyer also saying farooks wife chose not to drive, and that his brothers never saw her face, because she wore a burka. David . Matt gutman here with me in matt, thank you. Our team with the family of syed farook marrying that woman he met in saudi arabia. Revealing their own shock tonight to that young wifes pledge to isis. They thought the couple was happy raising their 6monthold and heres what we were just told. Reporter when you hear the news that tashfeen pledged allegiance to al baghdadi, what do you think . I dont even know who that is, first of all. I dont know who shes pledging allegiance to and why shes doing it. Reporter when you hear shes pledged her allegiance to the leader of isis thats shocking. Thats shocking. I mean, like why would she do that . And how would she even know, you know, who he is. How is she connected to that. Information like that, its just shocking to me. Why would she say, oh, good job, or something, you know. Just terrible. Reporter shes never before ever said anything about him or about isis . No, never. Never. Shes never mentioned any political thing. Reporter as a couple, happy couple . A happy marriage . They have this beautiful 6monthold little girl. Yeah, they were happy. Yeah. Always happy with each other. They spent a lot of time with her. They kept to themselves a lot. They were a good couple. We thought that they went together well. They were private. Theres a lot of people very private, so its none of our business. They were private. But yes, they were together. That was the thing. They were very together. Loving to their daughter. Reiterating their belief that there were never any signs of real anger inside that home. Tonight the fbi revealing there is evidence this couple was, though, radicalized, inspired by an overseas terror group. No evidence they were part of a larger sleeper cell here in america. But tonight i want to bring in justice correspondent pierre thomas. Director comby had a strong message today. We know this is very what we hope you will do is not let fear become disabling. There were reports that a neighbor actually saw packages being delivered to that home, but didnt want to say anything, didnt want to profile this family. But pierre, it seems the fbi director today urging americans to make the call if they see something. Yes, david. The director said given the spike in mass shootings, a very real potential of terror, the days are over when people can afford to ignore warning signs and that lawsuit needs the publics help. There are indications tonight that associates and friends notice the suspicious behavior of the couple, but never notified police, david. Pierre, we also know the fbi reassuring americans knowing there are no known Credible Threats against the homeland that they know of. But when you see the scope of the arsenal discovered inside that home, a lot of people are going to be asking, how did authorities miss this couple . The couple was in contact the fbi had some suspicion of. But director comey said there was nothing unusual about those suspects. To be clear, the couple was not under any fbi investigation, david. The fbi director said they simply had no clue of the devastation that was coming, david. They were not on the radar. Pierre thomas again with us tonight. Pierre, thank you. Were also learning more about the four minutes of terror in the center right behind me, the assault weapons found in that black suv riddled with bullets. 6,100 rounds of ammunition. And of course, the remotecontrolled bomb that never detonated, left behind at the holiday party. Did they intend to set that off just as rescuers arrived . Cecilia vega revealing the moment the killer stood over her as she wondered, would she survive this. Reporter it was over nearly as quickly as it started. Four minutes of shear terror. It was a pop, pop, pop sound, reporter his wife was in that conference room, packed for a meeting and a holiday party. If she left 30 seconds prior, all the people she was sitting with, theyre all killed. Reporter her colleague sitting right there, too, until he mysteriously left. Today this is still a crime scene. This is as close as we can get to the roonl in there. This is what we know. When those shooters came back here, they were wearing tactical gear. They had extra ammo with them, and they were ready to kill. And thats what they did. Syed and his wife bursting in through a patio door, unloading at least 65 rounds. Anisa kandahar hid in a bathroom. Nobody came out from the bathroom. She warned, they closed the door. Reporter amanda fell to the ground, hid under a table, closed her eyes and didnt move. The shooters fired right at her. Her family saying tonight the her in the head, but we are so grateful to god they shot her in the leg and arm instead. They are still treating survivors in this hospital here behind me, and all 14 People Killed raging in age from 26 to 60. They were mothers, fathers, best friends. David, tonight their families devastated. Cecilia vega here with us tonight as well. Thank you. We turn to the race for 2016, and the sudden surge for one candidate, of course, as terror now dominates the headlines. Donald trump now pulling ahead. Trump with the biggest lead since getting into the race. 36 now. Ted cruz taking second with 16 . Edging out carson with 14 , rubio with 12 . Heres abcs tom yamas. Reporter Republican Voters are turning to donald trump. Yesterday predicting his support will only grow. Sadly, every time, every my poll numbers go up. Because they feel that i am going to take care of them, and they feel they want strength. Reporter the new poll with trump way ahead, taken before the San Bernardino rampage. But after the horrific attacks in paris. Trumps message to the terrorists . Crass, but blunt. This is a vicious group of animals. Weve got to knock the cram out of them. I would bomb the [ bleep ] out of them. Waterboarding is just fine. Were going to win. Reporter trump says americans know he would protect the homeland. 46 say trump is the candidate best equipped to handle isis, and 42 think he would be the most effective at solving the worlds problems. The other candidates surging as the country grapples with the terror threat. Ted cruz visiting a gun range in iowa. You dont stop bad guys by taking away our gun. Reporter david, that new National Poll revealing Something Else interesting. Trump, carson, cruz, rubio, even jeb bush in a statistical tie with hillary clinton. More ahead on this friday. Other news of the evening, word about the e. Coli scare at a restaurant change much larger than we first thought. The forecast for the rest of the month leading into the holidays sure has got our attention today. The battle brewing between trader joes and the favorite cookie company. Did they steal their famous recipe . Youll see it side by side. exec 1 well, directv beat us in Customer Satisfaction again for the 15th year in a row. 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Stay active with boost. Compact and 100 calories. Back now with more on the terrorism investigation here in california tonight. A new report showing at least ten american women in less than two years arrested for over family. And in this case, leaving behind heres abc chief Global Affairs correspondent, Martha Raddatz tonight. Reporter isis recruitment videos actively target young women, to be jihadi brides, bear children for isis fighters. There were those three young British School girls who secretly left home to join isis turkey on a route we recently traced. And this is the exact route the girls would have taken. Metro and come right in here to the urfa station. But some women, like accused killer Tashfeen Malik, want to be fighters themselves. These two former roommates from queens arrested earlier this year accused of planning to build a bomb for an attack in the u. S. Another u. S. Woman accused of telling an isis fighter she met online that becoming a martyr would be amazing. A girl can only wish. But for a mother to leave a 6monthold baby to carry out was a Suicide Attack seems incomprehensible. Theyre prioritizing martyrdom over all other aspects of their life, including raising a family. Reporter they say women should just play a supportive role in isis, but in recent months, clearly women have taken on far more active rolls. David . Eyeopening numbers tonight. Martha, thank you. When we come back, well turn to the other news, the major weather headline this evening. The forecast heading right into the holiday. What to expect. It got our attention today. And the e. Coli scare involving a major restaurant, turning out to be much larger than first thought. Well be right back. Them. Are you completely prepared for retirement . Okay, mostly prepared . Could you save 1 more of your income . It doesnt sound like much, but saving an additional 1 now, could make a big difference over time. Im going to be even better you can do it, it helps in the long run. 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