the world coming together, nearly 200 countries, finally reaching agreement. the cheering, the protests, too. the landmark pact called the decisive deal for the planet. a california mosque firebombed. tonight, authorities suspect it's a hate crime, apparent backlash after that deadly attack in san bernardino. now divers there pulling up objects from a lake. were they put there by the terrorists? and, the race to find hundreds of newborns, their moms and hospital workers exposed to tb. the medical emergency traced to the nurse who treated them. and, buyer beware. the online shopping sites that seem just fine, but just take your money. who to trust, as we scramble for gifts, and how to avoid being scammed this holiday season. good evening and thank you for joining us on this saturday. i'm cecilia vega. as we come on the air tonight,

celebrating a turning point on our planet. it took two decades, but now, a historic agreement on climate change signed by nearly every nation in the world. the bang of a gavel cementing the deal, a limit on greenhouse gas emissions that could reduce the effects of climate change. president obama offering his praise a short time ago, saying the agreement offers the best chance to save the one planet we have. but there are protesters weighing in, too. criticizing that deal for not going far enough. what is certain tonight, the affect of this agreement will be felt for generations. abc's alex marquardt starts us off tonight. >> reporter: a standing ovation and tears tonight, as almost every country in the world agreed to the landmark deal aimed at preventing catastrophic climate change. tonight, the white house called it the most ambitious climate change agreement in history. >> this agreement represents the

needs to solve the climate crisis. >> reporter: 195 countries signing onto the agreement. the culmination of two decades of negotiations that had failed, until now. in the end, two weeks of intense talks outside paris, including several all-nighters for the delegates, led to the deal that goes into effect in 2020. whose goal is limiting the warming of the earth to less than 3.6 degrees fahrenheit. each country came up with a plan to reduce their greenhouse gas emissions and will be required to publicly report them. >e've reached an agreement here that is the strongest, most ambitious global climate change agreement ever negotiated. >> reporter: but much of the agreement is voluntary and not legally binding. developing countries, like china, which has seen horrendous smog in recent weeks, won't be required to report as much about their emissions, and the deal doesn't have a way to punish countries that don't live up to the agreement. climate scientists agree that global warming won't end because

saying it falls short, it's being celebrated around the world as a momentous breakthrough. cecilia? >> alex, thank you. and we want to turn now to our other top story, to california. an arrest in a firebombing at a mosque there. and investigators are calling it a possible hate crime. abc's aditi roy reporting in from the scene tonight. >> reporter: inside the blown-out door of this southern california mosque, the charred lobby, barely recognizable, after a fire authorities believe was arson, and tonight, authorities have arrested 23-year-old carl dial for suspicions of committing a hate crime. >> commercial structure fire with battalion 6-a on scene. >> reporter: the blaze erupting just past noon yesterday, after eye witnesses say a firebomb was hurled at the mosque's front door. >> there's a huge plume of smoke. mushroom cloud. >> reporter: several inside managing to escape as the lobby caught fire. worshippers later moved prayers to the sidewalk. when you look at this, what goes

>> sadness, actually. it's a family place. it's a social place for us. we just have to work on rebuilding it again. >> reporter: the islamic society of the coachella valley mosque is just 75 miles from san bernardino. the fire, one of several incidents that officials are investigating, as possible backlashes to those terrorist shootings. in all, there have been three times as many cases of vandalism and harassment at mosques this year than last. says the council on american/islamic relations. in philadelphia, surveillance video of a pig's head thrown at a mosque. threatening voicemails left at a mosque in st. louis. >> come my way and i'll [ bleep ] you all. cut your [ bleep ] head off. >> reporter: are you worried about other attacks happening? >> we are concerned about other attacks. the answer is yes. >> reporter: the acting imam here tells me it is unclear how long it will take them to rebuild. meantime, they are doubling security and reassuring families here that they are safe.

devastating. aditi, thank you. not too far from where aditi is reporting tonight, the desperate hunt for clues in that terror attack in san bernardino. fbi divers recovering objects from the bottom of this lakeke no word yet on whether they are linked to the husband and wife killers. and a childhood friend of one of the shooters being questioned again today, police saying he bought their most deadly weapons. all of this as more victims are are laid to rest. abc's kayna whitworth reporting in from san bernardino tonight. >> reporter: for the third day, searchers combing through this muddy lake in san bernardino. the fbi telling abc news, divers have pulled items from the water and are now analyzing them for any connection to syed farook and tashfeen malik. investigators are still looking for the couple's missing hard drive. tonight, far friend, enrique marquez, who bought the two rifles used in the attack, now in his sixth day of questioning by the fbi. >> he is probably sitting

as fbi hotel. so, he continues to talk and describe whatever he knows about syed and the female that was, you know, part of the attack. >> reporter: marquez hasn't been charged with a crime, and says he knew nothing about the plans for the san bernardino attack. but what he has told investigators is that farook had planned an attack in 2012, but got cold feet. nick rodriguez, who knew marquez from a local bar, said he remembered one chat back in 2013, but shrugged it off as drunk banter. >> he would just talk about how there are so many sleeper cells and when it's going to happen, it's going to be big. >> reporter: rodriguez believes marquez is p ptly responsible, no matter what he knew about the attack ten days ago. >> he turned his back on america. like i said, innocent people are dead. families broken up this holiday. people are missing. there's presents underneath the tree that are never going to be opened. >> reporter: today, those families saying good-bye to

johnson, who saved the life of his coworker, denise perazza, by shielding her from the bullets. his last words to her? "i got you." >> he's always about taking care of those who can't take care of themselves. >> reporter: shannon's brother described him as fearless today. he was certainly that in the face of terror. and now his name is inscribed on this wall of remembrance, along with the 13 other victims. cecilia? >> fearless indeed. kayna, thank you. we want to turn now to poll sicks. donald trumps in some unfamiliar territory, second place. a new poll out tonight showing him ten points behind ted cruz in iowa, and with a big republican debate just days away, the gloves are already coming off. abc's mary bruce reporting in from the white house. >> reporter: tonight, the bromance between donald trump and ted cruz is on the rocks. >> it's not a contest the two of us, just so we understand. >> reporter: as cruz gains ground, trump for the first time is taking aim at the texas senator, targeting his faith.

cuba. >> reporter: in iowa, trump jabbed cruz for opposing popular ethanol subsidies. >> if ted cruz is against ethanol, how does he win in iowa? because that's very anti-iowa. >> reporter: this iowa farmer tells us it's trump or bust. >> anybody else gets in, it's the same old garbage. nothing gets done. >> reporter: you think he's the only one? >> i think he's the one that can get it done, yeah. >> reporter: but trump also has kind words for his chief rival, saying cruz would have a role to play in a his administration. >> we would certainly have things in mind for ted, to be honest with you. >> reporter: in south carolina today, trump came under fire for his call to ban muslims entering the u.s. but he stands by his controversial proposal. >> we don't want people coming in and knocking down world trade centers and having what happened last week. >> reporter: and trump is already responding, blasting that new poll that shows cruz with a ten-point lead. trump just tweeting, "don't

he sails s says it's biased. cecilia? >> mary bruce at the white house tonight. thank you. and there will be a big democratic debate, too, right here on abc. join david muir and martha raddatz for the new hampshire democratic debate. your voice, your vote. one week from tonight, saturday, december 19th, 8:00/7:00 central. we turn now to that extreme weather this weekend. at least two reported tornadoes so far in east texas. take a look at this. homes damaged this afternoon in lindale. this neighborhood in shambles. and now, murlgeteorologist indra peterson is with us. welcome to abc news. but we do have tough weather to talk about a forecast that stretches late into this evening. >> reporter: that's the concern as we go to the overnight hours. we have severe thunderstorm watches up right now. portions of oklahoma and middle sections of texas, going to be watching for isolated tornadoes and a lot of strong winds, large hail and damaging winds out there. not to mention rainfall. oklahoma city, dallas, even austin could be seeing as much as four if not five inches of rain. we're talking about that threat

>> as they get hit there, here on the east coast, it does not feel like a day in december. you brought some warm weather with you. how long is this going to last for us? >> reporter: as i said, i feel very guilty, as they are suffering in the middle of the country. but temperatures, 25 degrees above normal. doesn't feel like december. we're talking about temperatures that should be in the 30s in chicago, they are looking for 60s. d.c. in the 40s, almost near 70 degrees tomorrow. i don't think there's many complaints in the eastern half of the country right now. >> keep the weather. thank you for joining us. nice to see you. and we do turn now to hundreds of parents in california's bay area. worried about what their newborn babies might have been exposed to at the hospital. what one nurse may have spread to those babies, and their moms, too. here's abc's ron claiborne. >> reporter: the news was stunning. 350 newborn babies at this san jose, california, hospital, possibly exposed to a nurse who tested positive for tuberculosis. those infants will now undergo daily treatment with antibiotics for the next six to nine months as a precaution.

be infected and start them on medications, until we can show for sure that they're not infected. >> reporter: in addition to the babies, 368 mothers and 338 hospital employees, who came into contact with the nurse between september and november, will be monitored, but not treated unless they test positive for tb. according to officials at santa clara clara, the nurse's annual tb checkup in september was negative. but in november, she saw her doctor for an unspecified complaint. and that doctor ordered a chest x-ray, which led to the diagnosis. the nurse has been placed on paid leave of absence. tb is transmitted through the air, by a person coughing or sneezing. >> she was not coughing up tuberculosis during the period of time that she was working. >> reporter: but the hospital decided to act just the same, and local health officials and the hospital say they have identified everyone who may have been exposed to the disease. and they're working through the weekend to contact them and

and i should add, cecilia, that doctors we spoke to said the antibiotics the newborns are getting, they are considered very safe and side effects very rare. >> tough for that hospital, but really scary for those brand new parents. >> reporter: really is. >> something else scary, if you haven't finished your christmas shopping, i haven't. a warning tonight for all us procrastinators. before you click your way to checkout, here's abc's gloria riviera with the holiday scam causing some big holiday headaches. >> reporter: this holiday season, beware of scam artists online, waiting for you. shopping for her daughter, mindy hayes clicked on an ad in her facebook feed for ugg boots, over 80% off. >> i was like, oh, great deal. >> reporter: too great. those boots never arrived. the online retailer apparently a fake. >> when i got my confirmation e-mail, it just didn't look legitimate. >> reporter: mindy, an avid online shopper, who works in i.t., was out $83. experts warn it could have been worse. more money or even her identity.

family and friends in danger. >> reporter: all of that can happen with just one click? >> absolutely. >> reporter: so, what should you be looking for? safe sites have an "s" with a lock in the url. fake sites often have typos and grammatical errors. real online businesses have extensive privacy policies. facebook quickly investigated, telling abc news it has "blocked this website from placing future ads." as for mindy hayes, she's working on getting her money back. >> it's hard to know, really, who you can and can't buy from online. >> reporter: gloria riviera, abc news, washington. we still have much more ahead on "world news tonight." coming up, it was once known as america's most notorious store for selling guns used in crimes. tonight, it is being forced to pay big bucks for the guns it sold. the settlement over the landmark ruling that could change america's gun debate. and, this, the hunt for more than $80,000 worth of stolen jewels.

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it's whooping cough, and people can spread it without knowing it. understand the danger your new grandchild faces. talk to your doctor or pharmacist about a whooping cough vaccination today. next, police in ohio say they have their man. and grabbed more than $80,000 in sapphires from a museum display case. and the suspect? he has a day job at a nearby college campus. here's abc's marci gonzalez. >> reporter: tonight, cleveland police searching for more than $80,000 worth of jewels. stolen, they say, by this popular part-time university lab instructor. in this surveillance video, you see a man police identified as hans wrage, casually stroll into the cleveland natural history museum last week. 30 minutes later, investigators say, there he is slipping out through a service door, getting away, according to this police

the shattered display case, missing seven valuable sapphires. >> as long as i've been down there, this is the first time it's happened, that any of these museums down here got hit like this. >> reporter: the 36-year-old part-time lab tech and physics teacher arrested yesterday and put on administrative leave by john carroll university. >> i'm surprised. i don't see that. kind of a quiet guy. does not seem like he would steal stuff, i don't know. especially $81,000 worth of jewelry. >> reporter: police telling abc news, wrage is still being questioned tonight, as detectives try to figure out where the jewels ended up. marci gonzalez, abc news, new york. still ahead on "world news tonight," the photo that had all of us here cringing today. the steel beam that smashed into this car's windshield at high speed. but just wait until you hear what happened to this driver. turns romantic, why pause to take a pill

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look at this. the massive steel beam falling off a truck and slicing right through the windshield of this bmw, right into the driver's seat. amazingly, the driver of that car escaped with just a small scratch on his arm. one firefighter on the scene says that man needs to buy a lotto ticket immediately. i would say buy at least two. and it is a special day for one of music's biggest legends. much more than this i did it my way >> yeah, today marks what would have been the 100th birthday of old blue eyes himself. nearly 20 years after his death, frank sinatra remains one of the best-selling artists of all time. more than 150 million records worldwide. 11 grammys, two oscars, three stars on the hollywood walk of fame, the presidential medal of freedom, the congressional gold medal and he is, of course,

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least expect it. could you be next? here's abc's john donvan. >> reporter: as sure as stars on trees and ribbons on boxes, our annual anonymous angels zigzagging across the map, the stories popping up like this one -- in alcester, south dakota, where at this toys "r" us, someone walked in and asked to pay down a bunch of bills for families buying christmas gifts on layaway. a gift to parents like ashley hanzlik. >> it was pretty amazing. i've never had anything like that happen to me. >> reporter: one of a kind, hardly, because, hop east, to bellingham, massachusetts. same thing, toys "r" us. debbie pendlebury goes in to pay her bill and -- >> i honestly was stunned. >> reporter: go west again, and "the kansas city star" followed a man handing out $100 bills. >> that's for you, buddy. >> wow. >> you can cry. i cry all the time. >> thank you! >> reporter: and onward, a salvation army kettle in billlerica, massachasetts, a diamond ring turns up there, valued at $3,500. another one in minneapolis gets a check for half a million

but as in epping, new hampshire, scene of yet another layaway payoff this week, benefiting robin ayers and company, when you don't know whom to thank, and that's on purpose, this is what you say -- >> merry christmas. >> merry christmas, you say? he said merry christmas. >> reporter: john donvan, abc news, washington. >> "gma" and "this week" in the morning. we will see you right back here tomorrow night. i'm cecilia vega in new york.

good night.