Terrorism. Shortly before syed farook and his wife, tashfeen malik, opened fire, malik took to her Facebook Page to pledge her allegiance to isis in syria. A federal Law Enforcement source tells cbs news this is a photo of malik, the photo they are working with. It is the first we have seen of her. The attack left 14 people dead. They were among about 80 San Bernardino county Health Department workers who were holding a holiday celebration. Homeland security correspondent jeff pegues begins our coverage. Reporter sources tell cbs news, maliks Facebook Post pledged her allegiance to isis leader abu bakr albaghdadi. The post was in english and issued under a different name. F. B. I. Director james comey the investigation so far has developed indications of radicalization by the killers and of potential inspiration by foreign terrorist organizations. Reporter investigators have recovered computers, thumb drives, and other Electronic Media from the home where malik and her husband, syed farook, lived with their sixmonthold daughter. Perhaps the most important find two cell phones discovered in a garbage dumpster. F. B. I. Assistant director David Bowdich says both phones were damaged deliberately. Those cell phones were were actually crushed. We have retained those cell phones, and we do continue to exploit the data from those cell phones. Reporter so far, investigators have no evidence that the shooting was directed by isis leaders, nor do they currently believe farook and malik were part of a larger terror network, although farook did communicate with at least one person in the u. S. And on an f. B. I. Watch list. There were no contacts between either of the killers and subjects of our investigations that were of such a significance that it raised these killers up on to our radar screen. Reporter farook was a u. S. Citizen and malik was pakistani living in saudi arabia when they met online and married in 2014. Fran townsend is a former Homeland Security adviser to president george w. Bush. Is there a possibility here that she radicalized her husband . Absolutely. Youll be looking for did she have more of the connections . Did she show more of an interest in islamic extremism, or did he . Reporter today, an isis affiliated website claimed the San Bernardino attack was carried out by isis supporters. Scott, that is a possible indication the plot was inspired rather than directed by the terror group. Pelley jeff pegues for us in our washington newsroom. Thanks, jeff. Farook, for some reason, picked his Health Department coworkers as the target. Whatever the motivation, carter evans found that the killers built a powerful arsenal. [gunshots] reporter when the couple died after a shootout with police, investigators found a stockpile of weapons and ammunition inside their s. U. V. Two semiautomatic rifles and two pistols, along with 1,600 rounds. At the couples home, 6,700 bullets and 12 pipe bombs, along with equipment and materials to make even more. A former f. B. I. Bomb expert estimated the arsenal cost up to 15,000. Federal investigators say the four guns were legally obtained. The handguns were purchased by farook. The semiautomatic rifles were bought by someone else. David bowdich is with the f. B. I. There is a person that we know of their location who purchased those weapons. The person is not under arrest at this point. Reporter investigators say the rifles were illegally modified to make them more lethal, and theyre now trying to determine when and how that was done. A Law Enforcement source told cbs news the bombs were nearly a carbon copy of explosives featured in al qaedas online magazine inspire. The title, how to build a bomb in the kitchen of your mom. As instructed, the couple used Christmas Tree lights as fuses and radiocontrolled toys as triggers. The source also said there were at least three unopened packages of remotecontrolled toy cars and numerous strings of Christmas Lights inside the couples home. Investigators also found four highcapacity ammunition magazines at the scene of the massacre behind me. California law bans any magazine that can hold more than 10 bullets, but, scott, they are readily available online. Pelley carter evans for us tonight. Carter, thank you. The f. B. I. Completed its investigation at theillers home and turned that rental house back over to its owner. Then the owner opened it to reporters, including David Begnaud. Reporter we are inside the apartment where we are told the shooters lived. The shooters apartment was turned upside down. There were dirty dishes in the kitchen, Identification Cards and personal documents spread across a bed. A baby crib and in a closet a can of gun cleaning oil. Saira khan lives 30 minutes away in the next town over. She is the sister of syed rizwan farook. Farhan khan is her husband. Did they have a large arsenal of weapons in their home . No, none that i know. All i know is he had one handgun, pistol. Reporter was there anything in recent weeks that troubled you about his behavior . No. There was nothing. He was normal. Our conduct was normal. Every time he came over, he just said, hey, hi, how are you . That was pretty much it. He was always shy and quiet, kept to himself. Reporter did you like his wife . Yes. Reporter how would you describe her . She was also shy, quiet, kept to herself, didnt talk much, but nice. Reporter there are people who cant fathom how a mother and father can drop their six monthold baby girl off and then go commit mass murder, maybe anticipating they might die and leave her behind. Yeah, we cant, either. I mean, we would never leave our kids anywhere. Why they could leave a six monthold is absolutely, like, bizarre. Reporter i wonder, have you asked yourself, what did i miss . Did i miss something . So many things i ask myself. I ask myself if i had called them that morning or the night before, asked him how he was doing, what he was up to, if i had any inclination, maybe i could have stopped it, of course. Reporter this car belonged to the male shooters mother. The f. B. I. Bashed through the drivers window and took shooting targets, legal documents, and gopro camera packaging. Scott, the mother lived in the apartment with the shooters and she has not been seen or heard from publicly since the massacre. Pelley David Begnaud reporting. David, thank you. San bernardino is a city in mourning tonight, and heres John Blackstone. Reporter at a growing memorial near the building where so many were killed and wounded, residents of San Bernardino have been leaving messages, flowers, candles, and tears. We ask that you accept the souls of those who were lost. Reporter even as investigators find new clues to the motive for the shooting, rafael sandez is struggling with the question about the killers that seems impossible to answer. How can somebody with a six monthold child have so much hate . Reporter with thousands of candles, the residents of San Bernardino tried last night to lift the darkness that has settled over this community. The family of Bennetta Betbadal mourned a woman who fled islamic extremism in iran nearly 30 years ago, only to die in wednesdays massacre. She leaves a husband and three children. Her daughter, jolen, is 15. She supported me with my dreams. Everybody on twitter thats contacting me, saying how sorry they are, it just makes me, like, happy that somebody is there and cares. Reporter another of the victims, michael wetzel, had six children. Most were with him at church last sunday. This is our gingerbread carlie here who is in the nutcracker next week. Kayton, kylie, and andrew. Reporter six children now without a father and so many trying to bear the pain. This is really about the community. It is. Reporter how this has struck the community. It is, all horribly, really, really bad. Reporter the messages left here are heartfelt, offering prayers and condolences, but, scott, one of the notes up there says simply, this must end. Pelley John Blackstone tonight. Thank you, john. That message was heard on the president ial campaign trail, and it reignited debates over gun control, terrorism, immigration, and surveillance. Heres nancy cordes. I am convinced that was a terrorist attack. Reporter on one thing, there is bipartisan agreement we are dealing with an act of terrorism. Reporter but everyone has their own approach to the threat. G. O. P. Frontrunner donald trump wants to step up surveillance on mosques. You know, i have friends that are muslims. Theyre very nice people but they understand theres a big problem. Reporter Republican Chris Christie is pushing for the reinstatement of the bulk phone Data Collection program that was revealed by edward snowden. We need to do these things because if we dont do them we are putting you and your families at risk. Reporter Democrat Hillary Clinton pushed today for more bombings on isis in syria and more gun restrictions here at home. I gotta tell you, if youre too dangerous to fly in america, you are too dangerous to buy a gun in america, in my opinion. applause reporter the alwaysheated gun debate has gotten personal. The New York Daily News today called the head of the National Rifle association a terrorist. But republicans insist the focus on gun control is misplaced. To drive the point home, texas senator ted cruz campaigned today at a gun range in iowa. Has anyone in this room noticed that shooting after shooting after shooting occurs in socalled gunfree zones . laughter look, if youre a lunatic, aint Nothing Better to have a bunch of targets you know are going to be unarmed. Reporter congress is slated to leave for the holidays next week, so even if there was consensus about what to do now, scott, it isnt going to happen for a while. Pelley nancy cordes on capitol hill for us. Thank you, nance. The murder weapons in San Bernardino were versions of a very popular rifle called an ar15. It is a semiautomatic version of a u. S. Military assault weapon. Millions have been built, but a few are infamous. An ar15 was used to kill nine at Umpqua Community college in oregon in october. This ar15 was used in the murders of 12 in the colorado Movie Theater attack in 2012. And this ar15 was used in the murders of 20 first graders and six adults in newtown, connecticut. Dean reynolds has more on the ar15. And pull the handle back. Reporter at c. I. Shooting sports in normal, illinois, owner Stephen Stewart stocks the ar15 for a simple reason. Its a favorite among sportsmen, target shooters and competitors. Its also popular as a home defense platform. Reporter lightweight and easy to master with about 30 minutes of instruction, the ar 15 was invented in 1959 for the military, but was modified for civilian use beginning in 1963. The ar15 is americas rifle, and youre going to find more of those in safes at home than youll find of any other rifle in the country. Reporter civilian use of the weapon is an abiding issue, though. There was once a nationwide ban on such assault weapons imposed in 1994, following a number of Mass Shootings in the 80s and 90s. When it was lifted 10 years later, gun rights advocates cheered and sales rose, but the slaughter at San Bernardino and several other recent mass killings all shared a Common Thread the shooters used an ar15style rifle. The manufacture and sale of such weapons are highly regulated in six states, but here in Highland Park, illinois, theyre not just regulated theyre banned, period. Nancy rotering is the mayor. Why do people need assault weapons in their daytoday lives . Reporter to protect themselves. From what . Reporter a lawsuit against the ban which could have National Implications argues it violates the Second Amendment and while it is now before the u. S. Supreme court, the mayor is undeterred. If we all run around being afraid of being sued, where does that get you . Reporter now, we reached out to the local pediatrician who brought the lawsuit against the Highland Park weapons ban, scott, but neither he nor a representative of the illinois Rifle Association would agree to be interviewed. Pelley Dean Reynolds reporting. Dean, thank you. A former c. E. O. Faces prison for the worst mine disaster in 40 years. And, would a wing and a prayer be enough for a win when the cbs evening news continues. 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Reporter after 29 miners died in an explosion at massey energys Upper Big Branch mine in west virginia, federal investigators said the accident was preventable. Prosecutors blamed company c. E. O. Don blankenship for putting profits over safety. At the time, he told cbs news it wasnt true. We owe them everything we can do to keep them safe, and weve been doing that for years. Reporter but the jury did not believe him, finding him guilty this week, of conspiring to violate mine safety standards. Key evidence blankenship often recorded his own phone conversations, and prosecutors used them against him to show his emphasis on profit. Reporter gary quarles, a miner himself, lost his 33year old son gary wayne in the explosion. What does that evidence prove to you . That hes guilty, and more so, he he is the person that actually killed my son. He knew all of this was going on. Shut the mines down and get it right, and he didnt do that, because he knew if he shut it down it was going to take money out of his pockets. Reporter blankenship was found not guilty of more serious felony charges, including securities fraud. His conviction, scott, is for a misdemeanor, but he still could face up to a year in prison. Pelley anna, thanks. Well remember robert loggier when he come back. For years to come. How can you help . By giving a little more, to yourself. I am running for my future. People sometimes forget to help themselves. The cause is retirement, and today thousands of people came to race for retirement and pledge to save an additional one percent of their income. If we all do that we can all win. Prudential bring your challenges® cant afford to let heartburn get in the way . Try nexium 24hr, now the 1 selling brand for frequent heartburn. Get complete protection with the new leader in frequent heartburn. Thats nexium level protection. 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