welcome to "world news tonight." on the trail of terror. the homegrown attack in san bernardino. new clues on the quiet couple that transformed into terrorists. neighbors revealing how syed farook changed in front of their eyes. those assault rifles traced back to his childhood friend. >> did he provide the guns to farook? >> plus, what the couple's family says about the attackers' mission for jihad. addressing the nation. the president's rare primetime message on keeping america safe. his former secretary of state hillary clinton, saying we are not winning against isis. london terror. station, stabbing several people. reportedly shouting, "this is for syria." excessive force? the suspected bank robber, armed

the standoff with police. the fatal end, caught on camera. and, billion-dollar dive. the sunken ship, buried for centuries. about to reveal one of the greatest treasures of all time. good evening. thanks for joining us on this very busy sunday night. i'm tom llamas. we begin tonight as president obama will address the nation, as a result of this husband and wife. launching the deadliest act of 9/11. and this home, neighbors of one saw him transform right in front of him. here's cecelia vega. starting us off from california,

attackers is emerging tonight. >> reporter: tonight, investigators searching for clues in another house not too far from here. tonight, the investigation turning to this home, and enrique marquez, his onetime friend and neighbor, suspected of providing the guns used in the massacre. the fbi raiding the home last night. >> did he provide the guns to farook? >> reporter: authorities say there's no information that marquez played any role in the shooting. leaving 14 dead. he has reportedly checked himself into a mental health facility. >> they kept to themselves. they're very neighborly. all their children, they're good kids. >> reporter: this neighbor said she noticed a change in farook about a year ago. what's the biggest difference?

withdrawn, started wearing his white thing, the long, draped outfit, whatever it is. and so he did start changing. >> reporter: but nobody said they noticed any warning signs of the terror to come. >> i never saw them talk about guns or say anything suspicious. >> reporter: tonight, this new photo of farook and his family. his brother and sister-in-law are angry for not knowing they were living a double life. do you feel like you didn't know your brother? >> no, at this time, i feel like he had a double life. life, very good at concealing everything from all of us. >> reporter: his father saying his son was fascinated with isis, and hated israel. and that he shared ideology with the isis leader. and his brother and sister saying they're in complete

they went to his house, never and tonight say they're grieving for all of the people that died >> cecilia, thank you. the hunt for any links the attackers may have had to jihadi recruiters or known terror groups. however they were inspired, this plot appears to be the kind of home-ground terror the fbi has long feared. here's pierre thomas. >> reporter: tonight, hundreds of fbi agents here at home and across the globe are in a race against time to uncover exactly what and who was behind the massacre in san bernardino. fbi officials are searching computers and cell phones associated with the killer couple in a desperate attempt to see if they were radicalized or directed by isis or other terrorists. the female killer allegedly swore allegiance to the leader of isis on facebook on the day of the assault. >> the most important part of

are they lone players, the two of them, or are they connected to other people? >> reporter: but if this couple was truly inspired by isis, it marks a dangerous evolution in the u.s. terror threat. the fbi director has been warning for months about an unprecedented social media campaign by isis encouraging potentially thousands of followers in the u.s. to attack. >> it's as if there is a devil sitting on their shoulder all day saying, "kill, kill, kill!" >> reporter: the social media marketing polished, not just violent, appealing to the young. there's evidence the marketing campaign is working. in the last two years alone, the fbi has identified or arrested nearly 90 suspected isis supporters from inside the united states. average age, only 25. at least 20 teenagers. 13 females. and 15 of those arrested accused of trying to launch murderous plots here at home. the nation narrowly averted the first isis-inspired massacre in may when two men armed with assault rifles tried to attack a texas cartoon conference about

and now this young suburban couple who left behind a 6-month-old baby and went on a vicious killing spree. law enforcement is struggling to cope with the new isis social media threat. which has found a young, captive audience, that can strike without warning. tom? tom? and president obama will speak to the nation tonight, the topic terror, specifically home-grown terror. coming after he and his national security team held a weekend meeting on the san bernardino attacks. jonathan karl joins us now. why is the president speaking tonight? >> the president knows people are on edge after the attack in san bernardino. and the president wants to reassure people he's taking the threat seriously. he's going to give an update on

making it clear this was an act of isis-inspired terrorism on american soil. he will look at specifically what the government will do to deal with home-grown terrorism. and he will talk about actions he will say needs to be done on visas, guns, and other issues. but if you're looking for a that's not what the president this is an intensification of what's already being done. not a change in strategy. >> and he'll be speaking from the oval office. the podium there at the ready. and there's a reason for the rare setting for the president. correct? >> this is an extremely rare speech from the oval office. he's only given two others. but his other go-to venue, the grand hall in the white house is right now filled with christmas

be an appropriate background for a speech on terrorism. >> thank you. and the president's address begins at 8:00 p.m. eastern, right here on abc. and terror and isis is fueling the presidential debate. the presidential candidates talking tough. and hillary clinton parting ways with the white house, saying america is not winning the battle. trump saying some american muslims should be closely monitored. and cruz rising in the polls with an aggressive position. here's devin dwyer. >> reporter: tonight, hillary clinton says the u.s. fight against isis is falling short. too soon to say if we're doing everything we need to do. >> reporter: trump and clinton now in a statistical tie. today facing off about how to fight isis and talk about the terror threat. here's clinton on "this week". radical islam? >> the problem is, that sounds like we're declaring war against

>> radical islamic terrorism. you look at the names, what's happened, you tell me. >> reporter: trump is open to racial profiling. clinton is worried it could make the threat worse. >> they'll use that as a tool to say, we're at war against the west. >> reporter: both candidates want a more aggressive military campaign in iraq and syria. when ted cruz suggested this -- >> we'll carpet bomb them into oblivion. >> reporter: clinton says it's not that easy. >> it's hard to decide who the bad guys are. >> reporter: trump saying he will agree to a ban on the no-fly list. as for boots on the ground, trump said he's open to deploying american combat forces.

see more than the 50 special forces that president obama has approved. >> thank you. and let's head overseas, an apparent lone wolf attacker taken down in london. stabbing two before being brought down by police. authorities are treating it as a terrorist incident. jennifer eccleston reporting in from london tonight. >> reporter: cell phone video captures a terrifying scene. >> tase him, tase him, tase him, tase him. >> reporter: a man with a knife lunging at police at a london subway station after allegedly stabbing two people. >> it's a risk. life is a risk here. >> reporter: police subduing him with a taser. both survive but tonight scotland yard is calling the

police searching a home in london tonight. self radicalized from material on the internet. >> reporter: media reports say the man shouted, "this is for one witness on the scene shouting this -- >> you're no muslim, bro. >> reporter: the attack comes at time of high alert after a string of terror arrests and just days after parliament voted to launch air strikes against isis in syria. opponents had feared that move could trigger lone wolf attacks across the homeland. tonight, police are urging the people to remain calm but alert and vigilant. calling the threat of terrorism here severe. tom? >> jennifer, thank you. a shooting here at home raising questions tonight. this video capturing the final

police with a straight razor. authorities say he made a sudden movement, and two police officers responded very differently. here's marci gonzalez. >> reporter: tonight, investigators going frame by frame through this cell phone video and others shot by bystanders in miami beach as an attempted robbery suspect armed with a straight-edge razor was shot and killed by police. >> i saw the guy fall down and everything. >> reporter: investigators haven't said why one officer decided to use deadly force while another fired a stun gun. in this image you can see the filaments hitting the suspect just a moment before he's killed. >> a police officer on the street literally has a fraction of a second to make the determination whether deadly force is warranted. >> reporter: police identifying the suspect as a man with a record of bank robbery that had escaped escaped. officers confronted the man after he walked into a bank of america yesterday morning and allegedly handed this note to a

police say he then took off with barber shop. coming out grasping this barber's razor. leading to the deadly confrontation. >> he did raise his hand with the straight-edged razor in it and he was shot. >> reporter: investigators now going over these images, and video from at least one officer's body cam. looking into whether the shooting was justified. marci gonzalez, abc news, new york. next to the nation's weather. the northwest, bracing for a series storms this week. look at this wintry scene. icy roads making travel difficult. even closing i-90 for part of the time. this week, he have -- heavy rain and flooding could be the story. storm after storm battering the region. parts of oregon and washington could see a foot of rain by wednesday night. and some good news from former president jimmy carter tonight. four months after revealing he

cancer-free. the former president, now 91, was treated with surgery, antibody. holiday debate. is it a holiday or christmas tree? starbucks playing it safe with is christmas being disguised? and later, a scare in the causing his private jet to make

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>> at this time in our country and in our world, it's important to be inclusive. >> reporter: new jersey's charlene storey resigning this week after the city council voted to change the name of the "holiday tree lighting ceremony" to a "christmas tree lighting ceremony." >> it's not a holiday tree, it's not a pear tree, it's a christmas tree. >> reporter: that city councilwoman later reconsidered, deciding to stay on. but all across the country, christmas controversies are lighting up like trees. from the campaign trail -- >> if i become president, we're all gonna be saying merry christmas again. that i can tell you. >> reporter: to campus. some university of tennessee-knoxville students upset with a university memo urging inclusion, saying, "ensure your holiday party is not a christmas party in disguise." >> it's my god-given right to be able to have a christmas party. >> reporter: to coffee shops. starbucks stirring ire by

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back now with our "index." starting tonight with a cargo ship blasting toward the international space station. >> 3, 2, 1. lift-off. >> the unmanned ship carrying nearly 8,000 pounds of computer supplies, food and even some christmas surprises. it's the first successful supply launch to the iss since a trio of failures over the past year. now to a close call for actor morgan freeman involving a crash landing. a tire blew on his private jet shortly after take-off. the pilot started burning off fuel then made an emergency landing in mississippi. freeman thanked his pilot, saying, quote, "we landed safely without a scratch. i cannot say the same about my plane." college football now.

the top four teams have been number one clemson will take on the orange bowl. number two alabama will face off the cotton bowl. both games set for new year's eve. and tonight, a moment to abc family. former white house correspondent bob clark, best known for his live reporting on the kennedy and robert f. kennedy, has passed away. bob was a contributing host to the sunday program "issues and answers." bob clark was 93. still ahead, a deep sea why the location of this sunken treasure was kept a secret for years. and why it's being called the holy grail of ship wrecks. or stop to find a bathroom? cialis for daily use is approved to treat both erectile dysfunction and the urinary symptoms of bph, like needing to go frequently, 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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finally tonight, the discovery of a ship that sank off the coast of colombia 300 years ago. it's being called the holy grail of ship wrecks. here's neal karlinsky. >> reporter: in these first images from the ocean floor, you can clearly see vases, cannons, and what looks like coins. so much gold, colombia's president making a claim as big as the discovery. "it is one of the biggest findings and identification of underwater heritage in the history of humanity," he says. the spanish galleon, the san jose, sank on june 8th, 1708, in the caribbean off the coast of cartagena, colombia. it was 150 feet long and armed with 64 guns. estimates of the treasure on board, believed to include emeralds, gold and coins like this one shown on the facebook

silver vary widely. from an astonishing $4 billion to as much as $17 billion. "it is a job of many years with many people," says a member of the team. "a huge triumph." dive teams have kept the exact location of the galleon secret, for obvious reasons. it was found in 1,000 feet of water during what was very much a high-tech treasure hunt. tonight, what is thought to be one of the world's most valuable shipwrecks is a secret no more. neal karlinsky, abc news, los angeles. >> we thank neal for that story. we thank you for watching. "gma" first thing in the morning, and david muir will be right back here tomorrow night. i'm tom llamas in new york. for those of you celebrating, happy hanukkah.

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