captioning sponsored by cbs >> villafranca: breaking news from britain tonight. ( sirens ) terror in london. police kill an attacker, aer he goes on stabbing spree on a busy street. also tonight, lashing out! president trump takes shots at political rivals-- and his impeachment-- in a super bowl sitdown. >> it's been a very, very unfair process. >> villafranca: caucus countdown. >> hello, indianola! >> villafranca: democrats barnstorm across iowa, making their final presidential pitches before tomorrow's first-in-the nation contest. >> now is the time for action. >> villafranca: restricted s try. travelers face new obstacles, as the u.s. rushes to slow the spreading coronavirus, while things get extreme at ground zero. and, they came, they saw, they

stayed. how these slippery sea lions became a san francisco treat. ( barking ) n this is the "cbs weekend news." >> villafranca: good evening, i'm omar villafranca. tonight, investigators in london are looking at possible terrorist links to the man who went on a stabbing spree on a busy street. police say the attacker was wearing a fake bomb. he was shot and killed by officers. three people were injured. roxana saberi starts us off tonight from the london suburb of streatham. >> reporter: this video posted on social media shows the moments right after the attacker was shot dead by london police. >> shut the door! go to the back of the store! >> reporter: an armed plain- aothes officer orders onlookers to take shelter in a shop. police say the attacker was under surveillance when he stabbed two people on this busy road, and that a third was x byex theos givunshdeotvis.ce

was strapped to the suspect's body. they believe the attack was linked to islamic terrorism. >> the young male, wearing something they say was a vest, and behind him, three plainclothes police officers with a gun. >> reporter: as forensic officers worked into the evening, and a police helicopter flew overhead, local resident anne-marie o'leary told us she ran home with her kids when she heard about the attack. but she praised the quick police response. y i didn't know they could get on the scene so quickly, and as quickly as they did, it was quite phenomenal. i actually really feel quite reassured and safe. >> reporter: the attacker was not only known to the authorities, he was also reportedly recently released from prison, where he served time for terror offenses. that is reminiscent of another attack here in london in november, when police shot a convicted terrorist after he stabbed two people to death. omar?

>> villafranca: roxana, thank you. president trump is hosting a super bowl party at his golf club in palm beach, florida tonight. but wednesday's scheduledvery t acim on his mind. ben tracy is traveling with the president. >> it's been a ver viry y,fapern interview with fox news host sean hannity, president trump was asked if he can still work with democrats in congress after impeachment. >> well, i'd like to. but it'srdontt'ty p ye , abwho. they don't care about lying. i , i'm not sure that they can do it, to be honest. i think they just want to win, and it doesn't matter how they win. >> reporter: while an acquittal of the president this week is all but assured, house manager adam schiff says he will keep trying to convince senators to convict. >> we're still going to go into to the senate this week and make the case why this president needs to be removed. it will be up to the senators to make that final judgment, and accountable for it. ( cheers and applause ) the president is looking beyond impeachment.

on saturday night, he was the wtar of a campaign kickoff show at his mar-a-lago club, and is now increasingly focused on his 2020 opponents. >> i would love to run against bloomberg. i would love it. >> reporter: but a barrage of anti-trump tv ads funded by billionaire businessman mike skoomberg seems to be getting under the president's skin. ab donald trump is counting on being able to divide america to win the election. >> reporter: in a series of tweets, mr. trump has dubbed bloomberg "mini mike," a knock on bloomberg's height. >> and now he wants a box for the debates, to stand on. okay. it's okay. there's nothing wrong. you can be short. why should he get a box to stand on, okay? he wants a box for the debates. >> reporter: the bloomberg campaign is not shying away from the fight-- in fact, it seems to be trying to out-trump trump. in a rather remarkable statement, the campaign this afternoon said "the president is lying. he is a pathological liar who lies about everything, his fake hair, his obesity, and his

spray-on tan." welcome to campaign 2020. omar. >> villafranca: ben, thank you. it's down to the wire in iowa. the presidential candidates are frking their final pitches today ahead of monday's caucuses. the latest cbs news battleground tracker poll shows former v.p. joe biden and senator bernie sanders in a dead heat at 25%. pete buttigieg is a close second, followed by senators elizabeth warren and amy klobuchar. nikole killion is in the hawkeye state. >> you have made me a better candidate, and you will make me a better president! thank you! ( cheers and applause ) >> reporter: on the eve of the iowa caucus-- >> i do a lot of grassroots politicking. you're not going to see one of my ads in the super bowl. >> reporter: --the democratic presidential candidates blitzed the state, a >>l leo the do well in so bend mayor is selling himself as

r: t"change" candidate over his more established and progressive rivals. hoping to run up the score, senator bernie sanders aimed to do what he almost did four years ago-- win. >> if we win here, we have a path toward victory, and together, we will defeat the most dangerous president in modern american history. thank you all so much. >> reporter: but in his closing arguments, former vice president joe biden maintained he's the e st candidate to take on president trump. >> i do have a nickname i want to give him: former president. former president donald trump. ( cheers and applause ) >> reporter: off the stump, voters at this des moines diner considered the options on their plate. >> i've been a supporter of bernie in the past. and, i just like elizabeth-- well, the fact that she's a woman. >> i think i will probably vote for trump again this year. >> i'm going to caucus for andrew yang. >> reporter: one key barometer

of which way voters are leaning is the iowa poll. it has long been considered a gold standard and predictor of who might win the caucus. but it was abruptly canceled after someone from the buttigieg camp raised concerns about how it was conducted. omar? >> villafranca: nikole, thank you. cbs news will have special overage of the iowa caucuses starting tomorrow on the "cbs evening news" with norah o'donnell, and throughout the night as results come in. and on tuesday, norah will anchor our primetime coverage of president trump's state of the union address from washington d.c., starting at 9:00 p.m. eastern time, 6:00 p.m. pacific. tough new restrictions take effect today as the united states tries to contain the spreading coronavirus. worldwide, confirmed cases now top 16,000, most of them in china. more than 360 people have died. there are now nine confirmed cases in the u.s., including a woman confirmed today in california. all flights from china are being directed to seven u.s. airports

for passenger screening. there's concern officials are not adequately prepared for the task at hand. here's jonathan vigliotti. >> reporter: u.s. citizens returning from china's hubei province will now face mandatory quarantines lasting as long as two weeks. their possible home upon return, one of four military facilities around the country, including california's travis air force base, where up to a thousand people could be held. non-u.s. citizens who have recently been in areas impacted st the coronavirus will be temporarily suspended from entering the united states. the c.d.c. says it's the first quarantine order by the federal government in over 50 years. the historic crackdown coming as more americans test positive for the virus. national security advisor robert o'brien spoke this morning on "face the nation." >> we're up to almost 15,000 cases of infection in china. i think, 300 deaths. so, right now, there's no reason for americans to panic.

this is something that is a low risk, we think, in the u.s. >> reporter: low risk, but not no risk. a boston man tested positive on the student, in his 20s, returned from wuhan, china last tuesday, one day before logan airport began screening for the virus. he's being monitored at his home. >> anyone who came in contact with him, we're working on that situation. medicaprofessionals righttm away. >> reporter: the rate of infection is nearly double that of the sars outbreak in 2002, but what in what many experts call "encouraging," the coronavirus's mortality rate is significantly less. omar. >> villafranca: jonathan, thank you very much. china is ground zero for the mysterious coronavirus outbreak. it's also where authorities are going to extremes to contain it, tod help the infected. ramy inocencio is in beijing. >> reporter: nearly 60 million people are still on some kind of lockdown here, but that has not stopped the virus from traveling. on saturday, the philiin confits first h the vi and thei.

that was a 44-year-old man from wuhan. now, in wuhan, the government infected with the virus, while a growing list of countries are banning foreign nationals who have traveled to china or to the virus' epicenter in hubei province-- that includes the united states, japan, new zealand and the philippines. here in beijing, china's capital and biggest city is still unusually quiet. many people haven't come back from the extended lunar new year holiday. the people here are mostly staying at home. stores are short of masks and hand sanitizer, as anxiety grips the city. even american powerhouse companies apple and starbucks have temporarily frozen operations. here in beijing, more than 700 miles to the north of the epicenter, people arly wng masks thishopping center, on a weekend, would normally be crowded. to minimize the movement of

to leave their home every other day to buy household items. and china's government is now coming under increased scrutiny, with critics claiming officials tried to quiet the earliest reports of this virus. and the british medical journal "the lancet" released a study saying that more than 75,000 were infected with the virus as of last week. now, if that i >> villafranca: ramy, thank your ouvery muc, h.it w in east africa today, somali officials declared a national emergency. billnsf locus arswarng acss theegion, threatening upe country's food supply ahead of this spring's harvest season. heavy rains are blamed for the infestation, and they're calling it the worst in 25 years. australian scientists today demanded their government take urgent action on climate change. they're speaking out as wildfires rage south of the capital, canberra, and.

ofzens of homes were destroyed it was unseasonably warm tod across a big pof the in denver, the mercury hit 69! t dtin pennsylvania, his shadow this morning. so you can expect an early spring-- but it looks like winter, as usual, in the week ahead. stew ms.l "s cheaormue ah how legalized marijuana may be behind more driving accidents than first thought. this super bowl sunday is unlike any other in more than 900 years-- we'll explain why. and later, how these smelly barking squatters became a fan favorite in san francisco. san francisco. hustling through thet. asking for science not sorrys. our time for more time - has come. living longer is possible

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it's a lifelong adventure finding all of these new connections all the time. greater details. richer stories. and now with health insights. get your dna kit at ancestry.com. >> villafranca: there is a new warning about the skyrocketing number of crashes involving marijuana. a a.a.a. study, out this weekend, looked at ten years of

traffic deaths in washington state. it found the number of fatal accidents involving drivers high on marijuana has more than doubled since pot was legalized there in 2012. here's kris van kleave. >> reporter: 16-year-old chad britton was walking to his car during lunch when he was hit and -olled in front of his high school by a teen driver high on pot. >> he was a beautiful soul. he'd do anything for anyone. >> reporter: new data reveals during the five years before and after washington state gave a green light to recreational marijuana, deadly crashes where a driver tested positive for active t.h.c. more than doubled. in 2017, more than one in five were high. a.a.a.'s jake nelson worries the rate of driving stoned is reaching a new high as legalized cannabis becomes more widely available. >> if you're going to use marijuana, you shouldn't drive. and if you know you have to drive, you should not use marijuana in any shape or form. >> why are you driving around smoking? you know that's not a good idea, right?

>> yeah, yeah, i do. >> reporter: dash camera video shows the kinds of run-ins with potentially high drivers washington state police say are happening more often. >> very common. we run into it every day. >> reporter: state patrol lieutenant bruce maier says ruivers often mix pot with booze or with other drugs. >> it affects your cognitiveiti, abitil slows down your reaction times. >> reporter: research from 2018 shows crashes overall were up 6% in washington, nevada, and oregon, compared to neighboring states where marijuana is banned. recreational pot is now legal in 11 states, and it's allowed for medical use in 22. in a recent survey of more than 11,000 colorado drivers, 69% of people who identified as cannabis users said they had driven high in the last year--ev better while stoned, leading to p.s.a.s like these. >> the police can't tell driving high. ( buzzer ) >> reporter: a.a.a. says states need a two-tier system to

istermine who is too high touse. >> laws that limit how much t.h.c. can be in a person's blood, as a driver, are completely meaningless, in terms of allowing us to predict how impaired somebody is behind the wheel. >> reporter: a.a.a. does oppose the legalization of recreational marijuana, saying it's a danger to auto safety. norml-- a group that lobbies f the gaorlitionf pot-- argues that the a.a.a. study has some flaws. they say the increase in stops, that's due to more people testing for the presence of marijuana, and that marijuana can stay detectable in the body for days after it is consumed. kris van cleave, cbs news, los angeles. >> villafranca: still ahead on the "cbs weekend news:" as the staples center in los angeles. still ahead on the center in los angeles begins to dismantle the massive memorial to kobe bryant, his wife makes a special request.

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>> villafranca: we close tonight with some beloved but noisy neighbors in san francisco-- celebrating 30 years at their seaside home, while never paying a penny for rent. here's john blackstone. >> reporter: it was 30 years ago this month that hundreds of smelly, noisy sea lions invaded the boat docks of pier 39 on san francisco's fisherman's wharf. they've been calling this home ever since. >> big guys and little guys and surly teenagers. >> reporter: and the big guys, they can certainly throw their weight around. >> oh, yes. ( laughs ) and they do! >> reporter: sheila chandor had just started her job as harbor master back then. >> if you can imagin1,400 anals on that dock, it was just a seething mass of sea lion noise. >> reporter: and smell. >> and smell. >> reporter: but in the years

since, these blubbery marine mammals have become an unlikely tourist attraction. tve you done any estimate of how many tourists over 30 years now have all come to see the sea mions? >> it's got to be in the millions. >> reporter: in appreciation for bringing in all those tourists, san francisco is celebrating the sea lions with 30 colorful sculptures going up around town. so what's the reaction been to these so far? >> pretty fantastic. i mean, they've hit social media posts almost nonstop. >> reporter: george jacobs, c.e.o. of the aquarium by the en pnted to deliver messages. >> this one has messages from all the pollutants and the chemicals that are in the ocean. >> reporter: they're beautiful, and they're not noisy and they don't smell. >> correct. >> reporter: and they provide a photo opportunity for sea lion fans who can't get close enough the real thing. there's also been a cake, and a proclamation by the mayor. >> it will always be remembered as sea lion day in the city and county of san francisco. ( cheers and applause ) >> reporter: it's a lot of excitement over an animal that ant me entertainmentime

from these things, and i got nothing. >> reporter: that seemed to be enough for mick and jeanne abraham from england. why is it interestin these guys? >> we've been all over, tog toah different places in the world. we've never seen whales, we've never seen kangaroos in australia, or koalas, so we thought we might take a chance on these. >> reporter: the sea lions are ryo tndha tt one day they'll find somewhere else to go. >> we do. but we don't speak about that. >> reporter: they've gone from a nuisance to a necessity, from an annoyance to an attraction. you could say the sea lions have sealed the deal. john blackstone, cbs news, san francisco. free in san fran, big deal. that's the "cbs weekend news" for this sunday. la cbs, "60 minutes." i'm omar villafranca reporting in new york. good night.

now at 6:00 there are three new confirmed cases of the wuhan coronavirus, in the united states. all of them are now in california. >> the world, the united states and here at sfo stepping up at efforts to fight the coronavirus. wild wind toppled trees across the bay area and they are about to blow something else our way, freezing temperatures. good evening.e new coronavirus cases, two just to our south in san benito county. another in santa clara county. >> let's get the desk now.

>> reporter: the case involves a man who recently traveled to wuhan china, his wife caught the virus when he returned. both are isolated at home, tonight. so, is the second confirmed patient in santa clara also isolated? a woman who also travel to wuhan and visited family immediately after on january 23. health officials say the risk of the general public contracting the virus is low. the patient has stayed home since her arrival to the bay area, except on two occasions when she sought medical care. they also say she was never sick enough to be hospitalized, and has been regularly monitored . county officials however say they anticipate confirming additional cases, in the near future. it would not be surprises if we have another case, what would be significant as if we had a case without a history of travel, to an area where we know the virus is circulating. it could be