Fear the most and why they are so hard to stop. Nightly news begins right now. Good evening. We begin here tonight and we are seeing for the first time the face of mag eek, the female attacker in San Bernardino. She and her husband syed farook live add mong us, walking this very sidewalk, lived in this complex and they did the very thing many of us have voiced so often was inevitable, they attacked our country from the inside. The head of the fbi saying today the massacre here on wednesday was an act of terror. The tipping point, a facebook posting from malik in which she pledged allegiance to the leader of isis. Tonight we take you inside of the apartment where the husband and wife planned their deadly attack. The suspects sister giving an in sight into what the life of her sister and brotherinlaw were liked and how the people we tush to protect us say about what happens now in this country. We start with justice correspondent pete williams. Reporter just as wednesdays attack on the farook felly county employees, his wife sent an endorsement of isis to her facebook timeline. Officials say she pledged support for al baghdadi. Facebook said the company took her profile down. The fbi director declined to comment on that. But explained why this is now a terrorism investigation. The investigation so far has developed indications of radicalization by the killers. And of potential inspiration by foreign terrorist organizations. Reporter but he declined to specify which terror there is no sign the couple was in direct contact with any terrorists here or overseas. We have no indication that these killers are part of an organized larger group or formed part of a cell. There is no indication that they are part of a network. Reporter comby stressed that the investigation is only about 50 hours old and said there is no way to tell yet what the couple s intent was, why they attacked the county facility or whether they planned other attacks. An internet media site friendly so isis posted a message saying the attack was carried out by two supporters of the islamic state. Investigation is analyzing computers and cell phones left behind at the couples apartment in redlands. Acknowledged the devices were damaged. I was told they were in a nearby trash can and found by our investigators. Investigators here and overseas are delving into maliks past. Raised in saudi arabia would become her she arrived in the United States on a flight to chicago a year ago. A big question for investigators, did she radicalize her husband . And did she come here intending to do that . The fbi has concluded the search of the apartment where the couple lived. Officials say they found three more Remote Control pipe bombs like the one left behind at the scene of the shooting. The fbi director and the attorney general once again urged people to report suspicious behavior. Ask if there is something somebody missed that could have prevented this attack, comby said based on past experience that is reasonably likely. Lester. And pete, from the moment we learned their names, the husband and wife killers who attacked here have been an aanything ma. Much of the past shrouded in mystery. Stephanie gosk has the detailed. Much of the life story remains unknown. She was a very, very private person. Pretty well isolated. She was very conservative. The marriage license said she was born in pakistan. At some point the family moved to saudi arabia where saudi government sources tell nbc she never raised any red flags. Malik returned to pakistan to go to college. Studying pharmacy at this prestigious university, according to reuters. From there it is believed she met farook online. Friends say they got married in saudi arabia and obtained a marriage license in august of 2014 in San Bernardino. Brotherinlaw. Did she make him happy when they were married. Did he change. They were a happy couple, absolutely. Reporter to get to the u. S. , the state department granted a visa. An application with personal and security information, Police Certificates from each country she lived in, a medical exam and photos and a passport. There are scores of and overstay visas. This is not one of them. Kristen welker at the state department today. Can americans have confidence in the visa processing system. Yes, they can. State department and interagency partners look at how we could improve it. We improved it after 9 11 and we continue reporter nothing about her visa application raise add larm bells. The fbi says malik and her husband were never on the radar. Lawyers for the family said malik spoke broken english. She didnt work and she was a stayathome mom and kept to herself. Lester. Stephanie gosk, thank you. And trying to shed light, we are hering from syed farooks sister, telling us about her brother and his wife. Here is what she said to Chris Jansing moments ago. What have the last few days been like . A bad dream. I want to go back to my normal life. How did you find out that your brother was a part of this and your sisterinlaw was a part of this . I found out on the news. What goes through your mind . Um, shock. Disbelief. They have the wrong person. And now today the fbi said this is a terrorism investigation which means your brother and his wife are considered terrorists. Can you wrap your head around that . No. Not at all. I mean, i have absolutely now idea they were involved in anything like that or they were even capable of doing Something Like that. Who were the people you knew . I mean, my brother, the brother that i grew up with, the shy introvert, kept to himself, quiet. You know, kids that we knew that grew up and got married and his wife was recently here. She was here for two years. We didnt know her that well. Did you see anything about him or her that would suggest radicalized . No. Never. What was their relationship like with the baby . It was great. They were great parents. I mean, my brother used to play with her for hours. She used to laugh as soon as he entered the room and that is the part that bugs us the most. Who is going to make her laugh now, you know. She would smile every time she would see her mother and she was nursing her. So, i mean, that is a big thing for a mom to leave a nursing child. Did you know that he had guns . I know that he had a gun. Have you even begun to figure out what your emotions are . I wish i could cry about it. But i have to keep it together for my kids. For their daughter and for my mother. Chris jansing with syed farooks sister. Tells us this is exactly the kind of attack isis has been calling for. Telling muslims in the u. S. And elsewhere to arm themselves, find targets and attack. Richard joins us now. What are you learning about any isis connection here beyond just an inspiration . Good evening, lester. A u. S. Counterterrorism official tell me that farook was in online communication with isis sympathizers and received messages of encouragement for attack. He said there was not any indication of, quote, command and control, that this was directed by or even ordered by isis. But the investigation is still underway. This appears to have been home grown and a fairly amateurish plot but it shows what terrorists could do when they have access to highpowered rifles. Lester. Richard, thanks. And no one who walked these streets would have any idea one of the houses had the home and has a new look at the evidence. Reporter earlier today, a bizarre scene at the suspects rental home. The land lord doyle miller removing plywood, allowing journalists and neighbors inside. Showing off where the two lived with their sixmonth old daughter and the couples mother. The apartment no longer a crime scene. Once the residents have the apartment and were not in it any more, we dont control it. It was broadcast live, including on msnbc. As you could see, the hard drive is gone. Reporter this is where investigators earlier found pipe bombs, ammunition and tools to make ieds. Carol lives next door. Im thinking all of that ammo and the pipe bombs, they could have been making a pipe bomb and blow us all up and we didnt even know it. Police photos show the highpowered rifles and the handguns used to kill. This cruiser hit with belt used to hold ammunition. Down. Reporter tonight processing the crime scene of the massacre. When we entered, there was fresh gunpowder and the smell of gunpowder in the air. Lieutenant mike madden was among the first to arrive. It was unspeakable. The carnage that we were seeing, the number of people who were injured and unfortunately already dead. And the pure panic on the face of those individuals that were still in need to be safe. Reporter the 26year veteran will never forget what he witnessed here. You cant let your emotions override your judgment. And you need to do the job that were supposed to do. Reporter after arriving at the crime scene, the lieutenant said he waited for three other officers. Then as a team they penetrated the building, looking for a possible shooter. Lester, they say they trained for situations like this for years but nothing prepared them for what they saw. Miguel, thanks very much. And were information on the attacks, those that were killed in the attack, the names have been released. Were also learning so much more about them and all that they leave behind. 14 people were killed at the inland regional center, leaving at least 22 children, young and grown, to spend the holidays without a parent. Like robert adams, who was planning his 20monthold daughters first trip to disneyland next week. And michael wetzel, father of six. Damien meins had two kids of his own and children. Harry bowman and juan espinosa, both fathers of two. Bet beddal, mother of three, fled iran at 18 to escape extremism. She came here to have a better life and better education and everything else. And unfortunately it was taken away from her at an early age. Two women in their 20s, just starting their careers. Specialist, sierra claiborne, a health inspector. Tim nguyen, engaged to be married. Her family said she brought happiness to shannon johnson, described as a funloving soul and a protector. And a devoight messianic jew. And another person trained at the shop. I believe that the world is going to be a much darker place with one person like daniel less. The youngest victim was 26yearold aurora godoy. The oldest, who celebrated his 60th birthday this year. He should have came home and sat down on the couch. That is what he does every day. He comes home from work. 14 families forever altered, left to share the legacies of the victims. An enormous loss not only to the Community Still ahead, tracking the digital trail of terror. Can Law Enforcement catch up with the way so m woman its been a journey to get where i am. And i didnt get here alone. There were people who listened along the way. People who gave me options. Kept me on track. And through it all, my retirement never got left behind. So today, im prepared for anything we may want tomorrow to be. Every someday needs a plan. Lets talk about your old 401 k today. If you could see your cough, its just a cough. Youd see how often you cough all day and so would everyone else. New robitussin 12 hour delivers fast, powerful cough relief that lasts up to twelve hours. New robitussin 12 hour cough relief. I found a better deal on prescriptions. We found lower copays. 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They are are well over a billion facebook users and social Media Networks that as they on social media, tom costello reports it is making the job of monitoring alarming messages nearly impossible. Reporter it is a top priority for federal investors, finding and scrubbing all electronic social Media Communication that the San Bernardino suspects may have utilized. We are going through a very large volume of electronic evidence. This is electronic evidence that these killers tried to destroy and tried to conceal from us. Reporter suspect Tashfeen Malik used a private facebook message to pledge allegiance to isis but it is likely no one noticed because it was private. Isis is fluent in social media n. Just one day last year it posted 40,000 tweets. Boasting of its brutality. And recruiting new members through an exploding Digital Community that offers secret communications with the ability to permanently delete. The acknowledge moves faster than law countless applications being created on a regular basis, all of them more conducive to being secretive. In San Bernardino, the fbi will look for anything that might tip them off to future attacks or terror suspects. Overseas or at home. Allowing them in look for certain motives or key words or certain key able to prevent this or be able to be spotted online before it happens. And facebook promised to remove any support for terrorism. But often it is too late. By the Time Facebook noticed maliks support for isis, the underway. Tom costello, nbc news, washington. And up next, the divide in this country over guns as rigid as ever after the san erectile dysfunction get and talk to your doctor about ask your doctor if your heart is healthy enough for sex. Do not take viagra if you take for pulmonary hypertension. Your Blood Pressure could drop to an unsafe level. To avoid longterm injury, an erection lasting more than four hours. 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The problem is the ideology of the people using the guns. Reporter the iowa gun range visited by ted cruz today not calling off the Campaign Stop after the attack. You dont stop bad guys by taking away our guns. You stop bad guys by reporter republican candidates arguing the conversation should be about terror control. They are still out there talking about gun control measures as if terrorists care about what our gun laws are. But democrats say it is a key to fighting terror. A part of that strategy is to try to prevent terrorists from getting their hands on guns in our country. Reporter today, a provocative cover of the daily news, photographs of mass murderers. The paper calling them terrorists andin including the head of the nra. Americans who make up less than 5 of the worlds population own more than 40 of the worlds guns according to an International Weapons research group. Nearly as many guns as people now. And more sold recently. On black friday, a Record Number of background checks coming at a time when many feel vulnerable. When evil knocks on our door the nra releasing this video after the shooting in paris. The right to defend our families and ourself with our second amendment. Senate republicans argued they are defending the right as they voted down a bill to ban people on the terror watch list from buying guns, a proposal democrats call common sense. Congress reflecting the divide and the rest of america, both dug in. Hallie jackson, nbc news, washington. From southern california, have to mass when a moment turns romantic take a pill . A bathroom . Pcialis for approved to treat both erectile dysfunction and the urinary symptoms of bph, like needing to gopfrequently, day or night. Tell your doctor about all your medical conditions and medicines, and ask if your heart is healthy enough for sex. Do not take cialis if you take nitrates for chest pain, as it may cause an unsafe drop in Blood Pressure. 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California, and all across the country, americans are sense of difficult times. Today, as this community prepares to lay the victims to rest, ceremonies were held for victims of two other Mass Shootings in the last three weeks. Nbcs Kevin Tibbles look at how americans are trying to cope with these events without giving up hope. Reporter today the funeral of a fallen officer taken in last weeks mass shooting in colorado springs. And a funeral of young californian, killed in the paris attack. As florist shops in San Bernardino now prepare for their funerals. You dont think it will happen out here. Reporter the endless cycle of Mass Shootings has left people everywhere feeling uneasy and unsafe. Monica maine is trying to process it all. Im actually shocked that im not shocked. Im just its wrong. Reporter as americans try to adjust to new reality, they worry about becoming numb in a world on violent you forget it because you become desensitized to it. Reporter this pastor counseled many who survived wednesdays horror. He struggles to find the words to tell his congregation. Should we ever be numb . No. Should we ever get complacent . No. Should we ever get used to it . No. And at the same time it is our reality. So many of us on emotional lockdown. But the human spirit is also about hope. I pray for peace. Peace on earth. And that we get it together as a society. Reporter as we pay our respects in a time of such uncertainty, the wish that a nation and a world can stand together. Kevin tibbles, nbc news, San Bernardino, california. Reporter and that will do it for us on this friday night. Im lester holt. For all of us at nbc news, thank you for watching and good [ duck quacks, wolf howls and wind whistling ] [ electronic beeping ] but