Involving one of the most popular items on gift lists this year. Tonight, a new warning. Good evening. Great to have you with us on a wednesday night. We begin with chilling new details about the young couple that turned into killers. From the start, authorities wanted to know if there were other attacks in the works. Tonight, authorities have discovered photos of a high school farook visited more than once. They wanted to know if it was a possible target. And the central question all along, what brought the two together . Now authorities telling us both were committed to terrorism before they even met. Youre about to hear what they discussed online before she came to america. Brian ross and his team on the trail again tonight. Reporter authorities tonight say they are investigating whether this high school in San Bernardino county and its 2,400 students were to be the next target of the terror couple. Photos of the complex have now been discovered on syed farooks cell phone, and according to these forms it is a place he came to at least twice last year as a health inspector. Were working very, very hard to understand did they have other plans, either for that day or earlier. Reporter tonight the fbi says even before farook brought pakistaniborn Tashfeen Malik back to the United States in the summer of 2014, even before they started dating, they were already committed terrorists. And online, as early as the end of 2013, they were talking to each other about jihad and martyrdom, before they became engaged and then married and lived together in the United States. Reporter which also means that whatever u. S. Background checks were done for maliks socalled fiance visa, they failed to discover that someone espousing jihadist violence was being allowed into the country. The government does not normally ask the Intelligence Community to look at the emails of Somebody Just because they want to enter the country. Theres just too many of them. Reporter an examination of maliks photos shows her evolution. As she went from wearing a loose scarf and makeup at the start of college, to a more and more conservative dress. Maliks facebook account has been taken down, but abc news was able to recover posts from the profile page of an account authorities believe was hers, showing a picture of a goat and a screen name in urdu, meaning a girl with no name. In august, 2014, she wrote, woe to coconut muslims, a derisive term for one considered brown on the outside, white on the inside. The fbi director said today his agents are investigating whether terrorist matchmakers are using fiance visas to get their people into the u. S. Do you agree with me that if it was arranged by a terrorist operative of an organization, that is a gamechanger . It would be a very, very important thing to know. Brian ross with us. Youve been reporting on the friend, and now another possible attack that had been planned that they didnt go through with . Yes, the fbi has been interviewing farooks friend, who provided him the assault rifles. Enrique marquez. According to members of congress that have been briefed by the fbi, he claims he and farook planned an attack in 2012, but got cold feet. After the fbi busted up another terror plot in a nearby city. Tonight, the fbi is trying to verify those claims and marquezs mental stability. As far back as 2012 . Thats right. Brian, thank you. This evening, our justice team uncovering that much of their communication on cell phones and computers was encrypted. Saying they were using apps that helped to hide any conversations, burying their trail. Just how hard does it become to track them . Pierre thomas, digging, and youre about to hear what he learned late today. Reporter abc news has learned they had devices with encryption on them. Blocking mechanisms making it harder for authorities to pick up all the critical details about the plot. Today, the fbi offered new details about how encryption can cripple investigations. The fbi says one of the isis sympathizers that died in a hail of gunfire in texas exchanged 109 messages with an overseas terrorist the morning before the attack. But the messages are encrypted, and the fbi six months later still can not uncover what was said. Pierre, you have reported for some time that authorities were worried about this very type of technology. Your sources telling you, this couple is another example of that . Yes, one official telling me this type of encryption is a huge problem, and it may keep the fbi from knowing whether these attacks are simply inspired by isis or correctly controlled by the group. Pierre, thank you. And now to the firestorm involving donald trump. Word coming in from one of the most revered american athletes of all time, a muslimamerican himself, muhammad ali. Saying, speaking as someone that has never been accused of political correctness, i believe that our leaders should use their position to bring understanding about the religion of islam. And clarify that the misguided murderers have perverted views on what islam is. Tom llamas with what trump said just today when asked, is a ban on muslims unconstitutional . Reporter tonight, facing criticism here and abroad, donald trump now insisting his ban on muslims coming to the u. S. Somehow has nothing to do with religion. Wouldnt a ban on muslims violate the constitutions freedom of religion . These are people that are not in the country, the people who are outside of the country. So were not talking about the constitution. And its not about religion. This is about safety. This has nothing to with religion. Its about safety. Reporter but today president obama taking a veiled shot at trump, at an event commemorating the 150th anniversary of the 13th amendment banning slavery. We betray the efforts of the past if we fail to push back against bigotry in all its forms. Reporter Hillary Clinton telling supporters in iowa trump traffics in prejudice and paranoia, and that the other gop candidates are one and the same. Their language may be more veiled, less, you know, dramatic, but their ideas arent so different. Reporter today trump, who loves to win, lost the title of times person of the year to german chancellor angela merkel. But time did release this today. Hows my hair . No good. No good. Reporter behind the scenes footage from their previous trump cover shoot. This bird is seriously dangerous, but beautiful. Reporter trump sharing the camera with an eagle. At one point trying to bit his finger. And tom is with us live. Donald trump reacting when he learned he wasnt named the person of the year . Thats right. Angela merkel was picked because of her decision to bring refugees into germany. Trump saying, i told you Time Magazine would never pick me as person of the year. They picked the person thats ruining germany. David . Tom, thank you. Were going to turn now to the anger in the city of chicago brewing at this hour. Reaching a boiling point tonight. There was an apology from the mayor, after it was learned a series of Police Videos were kept private, now made public. Tonight, pictures coming in of the protesters. Saying the mayor should resign. Videos of the shooting of laquan mcdonald, kept from the public for 13 months. Alex perez on the scene of the protests tonight. Reporter tonight, hundreds of angry protesters taking to the streets of chicago. Shutting down intersections along chicagos famed michigan avenue, the magnificent mile. Shut it down. Shut it down. Shut it down. Shut it down. Reporter and while the protests have been for the most part peaceful, they have been very vocal about what they want mayor rahm emanuel to resign. Who got to go . Rahm emanuel. Reporter the embattled mayor, under scrutiny for weeks since the release of this Video Showing Police shooting laquan mcdonald, who later died. Video city attorneys fought to keep under wraps. I own it. I take responsibility for what happened because it happened on my watch. And im sorry. Reporter but just outside, critics not buying the apology. The political theatre surrounding around today is so disingenuous. Reporter the normally combative mayor, sounding emotional and humble, telling the city council about a question a young man, who has had runins with the law, asked him. Do you think the police would ever treat you the way they treat me . And the answer is, no. And that is wrong and that has to change in this city. Reporter this large crowd of demonstrators dissipating, but other protests are scheduled this week. The mayor says his new task force will have concrete solutions for the Police Department come march. Alex, thank you. And the accused gunman of the Colorado Springs shooting last month appearing in court. 16 dramatic outbursts today, telling the room hes guilty. Declaring himself a warrior for the babies. Heres clayton sandell. Reporter tonight the man accused of opening fire at a Colorado Springs planned parenthood office, killing three people, wounding nine, in a fivehour gun battle was in court, restrained by handcuffs and leg shackles. Protect the babies. Reporter but defiant. In more than a dozen outbursts, robert dear says he is guilty. Claiming to be a warrior fighting for the unborn. Kill the babies. That is what planned parenthood does reporter dear is facing 179 felony counts, including first degree murder in the deaths of a Police Officer and two others. His public defender is the same attorney who represented aurora theater shooter james holmes at his insanity trial. Do you know who this lawyer is . Hes the lawyer for the batman shooter that drugged him all up. Thats that they want to do to me. Reporter the attorney suggesting that dear may not be mentally competent for the trial. Youre trying to silence the truth. You want to make this i think the problem is obvious, judge. Reporter dear has not yet entered a plea, and prosecutors have not yet decided if they will seek the death penalty. Clayton sandell, abc news, denver. Thank you. And well turn to extreme weather. Powerful storms, moisture clobbering the pacific northwest. Drenching rains, a dangerous commute home in tacoma, washington. A massive mudslide on u. S. 12 in Washington State. Neal karlinsky is in washington. Reporter tonight, meteorologists are calling it a fire hose coming in off the pacific. Lord, help me get through this. Reporter from seattle to portland, three days of storms havent just brought widespread flooding, but mudslides. Near portland, a 60yearold woman was killed when a tree fell on her bedroom. A series of mudslides temporarily blocked roads. One barreled through this waterfront home outside seattle, tearing through the first floor, the garage and cars, all of it while tyler fords grandmother was still inside. Devastating to see everything get turned upsidedown in an instant. But very thankful that everybody is alive. Reporter in some places, people have been rescued by boat. Next thing you know, its time to get out. Reporter the waters have now begun to recede. Not before portland smashed rain records two days straight. And seattle broke a record yesterday with 2. 13 inches of rain. The power of these landslides is just incredible. Not just the house thats been taken out, but theres actually a pickup truck in there and a car thats been swept into the water over there. And its these unstable hillsides that theyll be worried about because theyre so saturated, over the coming days out here. David . Neal, thank you. And lets get to rob marciano. You can see it, just the scope of the system here. The next system is a big and strong one. Theres a classic commashaped cloud pattern. Indicative of a mature cyclone. Warnings from california to colorado. The front comes from portland to seattle, san francisco, then the rain moves further inland over the next 12 to 24 hours. Another 8plus inches in some spots. More river flooding and mudslides. And there could be a Severe Weather threat this weekend. Rob, thank you. And now to Southern California and the dangerous gas cloud hanging over a community there. Many families saying its already making them sick. The infrared image showing the gas there in purple. Its been six weeks and hundreds of families have now been relocated. And Kayna Whitworth on the lawsuit tonight. Reporter what looks like clear skies in this Southern California community is actually a town under a giant cloud of gas. We have to close the windows. Reporter this infrared video appears to show methane gas leaking from an underground oil field owned by the Southern California gas company. The fact is, they should have evacuated these people a long time ago. Reporter lawyers say residents have been complaining about headaches, nosebleeds and vomiting. We just thought it wasnt safe there. Reporter the company saying the gas causes no Long Term Health problems. But Officials Say residents can be sicked by the foulsmelling additive used to signal a leak. Theres no threat to public safety. The area is closed off. Reporter the company says theyre working as fast as they can to close the leak. Tonight, the Health Department says more needs to be done. As it drags on to weeks to over a month, we need to focus on the trace chemicals. Reporter socal gas says it could take three to four months to fix this leak. Residents here want the gas Company Fined to ensure this never happens again. David . Kayna, thank you. Still so much more ahead on world news tonight. The warning about one of the most popular gifts this holiday. A hoverboard bursting into flames at a mall. The Safety Investigation under way, and the new warning. And the outbreak at a popular restaurant chain, the number of sick now soaring. And then, the mystery of the masterpiece. One of the worlds most famous paintings. Could it be true . Are there now several secrets hiding behind mona lisas hint of a smile . What they think theyve discovered, coming up. 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 about saving. You can do it, it helps in the long run. Prudential bring your challenges how with directv you could put tvs anywhere and not see cable wires and boxes in every room. Why cant we get people to just say cables, schmables . Hold on, hold on, i really like what youre doing there because if we just add schma in front of something, it just doesnt seem like a big deal. Boxes, schmoxes. There you go. Cold sore, cold schmore. Yes scotch, schmotch what . Ill take some of that schmotch alright. Schmank you vo get rid of cable and upgrade to directv. Call 1800directv. Were going to turn next to growing concerns about one of the hottest gifts this season. New images of a hoverboard bursting into flames in a mall. Investigations now under way in at least five states. Matt gutman getting answers. Reporter the flames so intense, it took two fire extinguishers to put it out. The hoverboard burning right near a baby stroller at this Washington State mall. It just exploded. Reporter fire officials tell abc news the selfbalancing scooter batteries overheated, and apparently its not the first time. This alabama man saying the batteries flew out of his scooter. And a woman in louisiana saying the scooter she bought for her son burned the house down. Like you lit a firework, i seen sparks flying. Reporter the Consumer ProductSafety Commission tells abc news its investigating incidents in at least five states. And reaching out to consumers in three others. The cpsc recommends only buying scooters imprinted with the stamp of Testing Companies like underwriters laboratory. The cpsc is calling this a highpriority investigation, and adds this tip. Dont charge it overnight, because if there is a problem, you want to be aware of it right away. David . Matt, thank you. When we come back, the man that created so much of the clothing people are wearing, the accident that took his life. Also, just in time for millions traveling over the holidays, the big change coming. 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Heres david wright. Reporter the most famous painting in the world has beguiled art lovers for centuries. But a french scientist says the mona lisa has been keeping a secret. Using multispectral scanning technology we can peel like an onion all the layers of paint. Reporter he claims to have uncovered as many as three separate paintings beneath the mona lisa. Including another woman, more slender, with a different face. And it turns out shes not even smiling. She is somebody else. Reporter that smile, still guarding her secrets. David wright, abc news, new york. Thank you for watching on a wednesday night. Im david muir. We hope to see you right back here tomorrow. Until then, have a good evening. Good night. Residents say their calls for help went unanswered. Why doppler 7 hd looks quiet, but w were getting read for one of the biggest storms of the year. Hundreds of protestors are demanding police tone down their use of force after officers killed a man with a knife last week. I was not expecting that. A man that shot this video that ignited a hate Crime Investigation in the east bay. And it has done nothing but hell living with them. No one answered a communitys call for help and tonight, those residents are angry. For one family, the situation has blown up in their face, leaving them with nothing. Good evening, im dan ashley. Im ama daetz. The fire last week was the final straw for a family that say there are uninvited guests in their neighborhood. Reporter these residents told us over the year, theyve complained about their nightmare next door. Officers did show up on several occasions but the people, and problems always came back. For residents of clara street, this fire was the final straw. It started in an rv on a property that neighbors have been complaining about for months. It was started from the camper next door. The people inhabiting the place are believed to be squatters. It left a fourplex gutted and extended family homeless. Weve been calling the cops and the city about these people. The cops came around, but they dont do nothing. They look at us like