captioning sponsored by cbs >> ninan: severe weather from coast to coast. heavy rain prompts flash boods and mudslide warnings in the west. hail hammers the south. the central u.s. falls into a deep freeze. also tonight, a van plows into a crowd in a historic german city. the driver takes his own life. a tragic bus accident in canada. at least 14 members of a junior hockey team are killed. >> there's a bit of shock and a bit of disbelief going on. >> ninan: the first of thousands of national guard troops are sent to the mexico border. will some western states refuse to send troops?

and moving day at the masters. who's still in the hunt heading into the final round at augusta national. >> rory mcilroy makes three at the 8. this is the "cbs weekend news" with reena ninan. evening. i'm reena ninan. the first week of april is ending with some wild weather across the country. shreveport, louisiana, got hammered by hail. it hit a car so hard, it set off the alarm. parts of kentucky got a coating of spring snow as temperatures dropped to record lows across the central u.s. meanwhile, heavy rain is drenching the west from southern california to seattle. here's carter evans. >> reporter: freeway overpasses turned into urban waterfalls as the massive pacific storm dumped a month's worth of rain on san francisco in just a day and a half. flooded roads caused rush hour gridlock downtown. friday was the second rainiest day since the gold rush in 1849.

the giants game was rained out for the first time in more than a decade. in sacramento, rainwater ripped out a retaining wall right next to sue calicutt's home. >> well, it looked pretty sturdy. i thought it was. >> reporter: others are worried local waterways could overflow. >> the creeks are overgrown with debris and brush, and it's just creating a flood hazard. >> reporter: rangers shut down yosemite national park and cleared out campgrounds near flooded areas fearing a repeat of the floods in 1997 that tore through the valley. now they're watching and waiting. >> we get to sunday morning, based upon the impacts, if they're minimal or there's not a lot, then we'll reopen. >> reporter: as rain melts the snow pack in the sierras above reno, emergency crews are preparing. the truckee river is expected to rise a foot above flood stage today. there's been so much rain, that most rez snrors northern california are now full. but state water managers are still urging residents to

conserve because parts of southern california are still in a severe drought. reena. >> ninan: carter, thank you. canada is in mourning after a bus crash killed at least 15 members of a junior hockey team. more than a dozen others were injured. the team was headed to a play-off game yesterday when a truck collide well the bus near the town of tisdale in saskatchewan province. nikki battiste has more on this tragic accident. >> reporter: these are the young faces of a canadian junior hockey team devastated by a national tragedy. emergency crews rushed to the scene after a semitruck collided with the humboldt broncos team bus in tisdale, saskatchewan. the team's two dozens players, ranging in age from 16 to 20 years old, coaches, and the bus driver were all on board. royal canadian mounted police say 15 people were killed and 14 others were injured. the driver of the semitruck was not hurt. three players held hands in a hospital. a twitter post said they were bonding and healing. in a hockey-loving nation,

humboldt's small community of 6,000 is reeling. >> there's a bit of shock and a bit of disbelief going on, a bit of thinking about how the community's going to handle this. >> reporter: family, friends, and supporters of the team have taken refuge at a local church waiting for news of loved ones. matteo carboni is the reverend. >> this is a good thing that people come together in the time of need, they don't stay at home when they're feeling isolated and alone. >> reporter: humboldt mayor rob muench said canadian prime minister justin trudeau offered his support. >> this is truly a dark moment for our city and our community and our province. you know, we're a small town, and-- and we're overwhelmed with the outpouring of condolences that we've received. >> reporter: a gofundme page for the tape has now raised more than $1 million. the website even stobd working

at one point. a vigil is being planned to honor the victims and, reena, the cause of this tragedy is not known. >> ninan: just heartbreaking for the entire community. nikki. thank you. the historic city of muenster, germany, was on edge today after a van plowed into a crowd of people. at least two were killed. 20 others were wounded. the driver killed himself. roxana saberi has the latest details. >> reporter: police say a van crashed into a crowd in the heart of the western german college town of muenster, sending people outside a restaurant running for safety. authorities say the driver then shot and killed himself. they have not confirmed his identity or motive. police spokesman andreas bode said, "it's too early to speak of an attack." but the authorities are not ruling out terrorism. this witness said he heard a loud bang, then screaming. he added, "for something like this to nap a small place like muenster, he won't feel safe in cafes anymore.

the crash took place on a warm afternoon in an area popular with tourists and local residents. another witness, daniel kollenberg, said people were sitting outside when the van plowed through the crowd. >> so the people are kind of scared, but they-- they didn't believe that it happened in muenster because it's really secure here, and i'm also shocked. >> reporter: the incident follows a series of attacks in europe using vehicles to kill pedestrians. in berlin in 2016 air, truck smashed into a crowd at a christmas market, killing 12 people. isis claimed responsibility. and exactly one year ago, a stolen beer truck plowed into pedestrians in stockholm, sweden, killing five people. a top german official says the driver in today's incident was a german citizen. he says so far, investigators have not found any links to islamic extremism. reena, police are looking for clues in an apartment where they believe the suspect lived. >> ninan: we know the german

authorities will follow this through. roxana, thank you. well, two u.s. soldiers were killed friday night when their helicopter crarved at fort campbell, kentucky, near the tennessee border. officials say they were members was 101st airborne. they were flying in an apache helicopter, just like the one you see here. the cause of the crash is under investigation. the two soldiers among seven u.s. military aerators to dive dye in training crashes in recent days. facebook c.e.o. mark zuckerberg will appear before two congressional committees next week. on friday, he announced new rules aimed at preventing further election meddling on facebook. advertisers who want to run political ads must now have their identity and location verified. president trump tweeted again today about border security. he wants to send up to 4,000 national guard troops to help fight illegal immigration and drug trafficking. paula reid has the latest from the white house. >> the texas national guard is preparing to immediately deploy with supporting aircraft, vehicles, and equipment to the

texas-mexico border. >> reporter: last night, texas became the first state to support president trump's call to fight drug trafficking and illegal immigration along the border. >> notifications will go out to soldiers who will be called up. these deployment activities are being coordinated, along with other southwest border states. >> reporter: secretary of homeland security kirstjen nielsen is seeking cooperation from all four border states, but it's unclear if california will participate. the state declined to send troops to the border in 2014, and it has been embroiled in a series of legal battles with the trump administration. >> we have very bad laws for our border. >> reporter: earlier this week, the president repeated his proposal: >> i'm speaking with general mattis. we will be doing things militarily-- until we can have a wall and proper security we'll be guarding our border with the military. >> reporter: on friday, james mattis authorized funding for 4,000 national guard troops. national guard troops have been deploying to the southern border

for decades. president obama sent 1200 national guard troops to the border in 2010. president george w. bush sent 6,000 in 2006. and wiel border arrests are down, the administration says it fears a spring surge of people coming across the border, like this man who, with the help of three others, was able to get over the barrier that separates juarex and mexico in less than two minutes. >> ninan: paula, we know the president is negotiating a potential interview with the special counsel. what can you tell bus those discussions? >> reporter: we know the president's legal team has been trying to negotiate a deal for the past several months, but we're hearing there could be an agreement in the next week or two. investigators want to question the president about his decision to fire former f.b.i. chief james comey, as well as interactions he has had with several other top justice officials. reena. >> ninan: paula reid at the white house. thank you, paula. new york city firefighters were called to trump tower in manhattan today. a fire broke out about 50 floors up. the president's son eric said on

twitter that the fire was in a residential apartment. no injuries have been reported. the fifth avenue high rise also houses headquarters of the trump organization and other businesses. northern oklahoma has been rattled by a swarm of earthquakes over the past 24 hours. the most powerful one hit this morning. it was a magitute 4.6 and centered near the city of perry. there are no reports of injuries or damage. but it was felt 100 miles away in wichita, kansas. parts of oklahoma also woke up to a rare april snow. a 49-year-old man from fontana, california, remains in custody for allegedly setting off explosives in a sam's club store. it happened thursday in the town of ontario. that's just east of los angeles. surveillance video shows shoppers running after one of the explosions. no one was hurt. police do not think it was terrorism. the suspect is due in court next week. coming up next, what was the motive for the youtube shooting?

and we'll take a closer look at how youtube works. and later, it's an important step to asset elephants, a major market for ivory is about to be shut down.

still looking into the motive for tuesday's shooting spree at youtube headquarters. a woman named nasim aghdam from san diego shot three people with a legally purchased .9-millimeter handgun. they survived. aghdam turned the gun on herself, and police say she was angry about youtube's policies and practices. john blackstone shows us how the company works. >> reporter: over more than a decade, youtube has grown famous as a place to share funny cat videos or to watch kids unbox the latest toys. >> wow! >> reporter: it's also faced

criminal for allowing videos that sexually explicit, violent, or portray abuse to children. that led to changes in the way youtube runs advertising and how it shares revenue with video creators. >> some who lost, you know, anywhere from 20, 30, 40, 50% of their income if not more loarpt eugene lee is c.e.o. of channelmeter, a company that measures video online viewing. certainly these changes made a lot of people unhappy. >> it angered a lot of youtubers who work hard for their content and come to the realization they're not making the money they used to. >> reporter: that may have prompted the attack on u.k.'s headquarters by nasim aghdam. youtube has not responded to our request for information about aghdam's videos, but lee's tools provide insight. would you have noticed her before this incident? >> i would have never noticed her before. >> reporter: since the shootings, however, he's analyzed her youtube activity, beginning in 20 terng posting more than 500 videos, a total of 17 hours, mostly about fitness, veganism, and animal rights.

then ba year ago, she started expressing her anger with youtube. >> my videos hardly get views. >> reporter: lee's analysis shows aghdam's videos had a total of about nine million views with 30,000 subscribers. but that's nowhere near what's necessary to be a youtube star. >> looking at her view count, this isn't necessarily someone who screams this is a person making a lot of money from advertising. >> please consider subscribing. >> reporter: the most popular creators on youtube have done well. you can make seven figures. >> absolutely. you can easily make seven figures. >> reporter: but only a few have that kind of success. aghdam finally did achieve youtube fame, but only with a tragedy that left three wounded before she took her own life. john blackstone, cbs news, san francisco. >> ninan: up next, it's moving day at the masters, so who's still in the hunt? our report from augusta national is coming up.

>> ninan: saturday at the masters golf tournament is known as moving day. it's when things starts to get serious. the georgia rain didn't dampen the excitement at augusta national. omar villafranca is there. >> reporter: as second-round leader patrick reed teed off, augusta national looks to dodge the threat of heavy rain. the wet course slowed downtown greens, letting players light up the score boards. rory mcilroy was dialed in early. this beautiful tee shot on the parr 36 allowed him to tap in for birdie. then on 8, rory's chip shot hit the flag and dropped in for eagle. that put him at 9 under. ( cheers )

tiger woods has never miss a cut at augusta as a pro, but is too far back to get another green jacket. he shot even par today, and the four-time masters winner says he wants to finish the tournament strong. >> considering where you stand on the leader board right now, what will you have to do tomorrow to consider this weekend a success? >> well, i'd like to get back to even par. that would be a nice goal, and hopefully maybe even do one better and get in the red somehow. >> reporter: despite the soggy conditions, fans like eight-year-old ryland pettitte still flocked to be part of a tradition unlike any other. it's raining out you're out here in the rain. why? >> because i want... signatures. >> reporter: from who? >> zach johnson. >> reporter: joe and paul white had no plans to miss this father-son trip. the two men ignored the forecast and came ready with umbrellas. >> we've got our seats already at a certain hole, and then we're going to sit there for a while, and then we're going to follow-- >> reporter: even if it rains. >> yeah, even if it rains.

>> reporter: most people would be leaving and you're not. >> no, no, this is-- i know, disney world says it's the happiest place on earth, but i think this is the happiest place on earth for adults. >> reporter: the weather on sunday is expected to be much better than this, which could mean a shoot-out in the final round. reena. >> ninan: omar, thanks. you can see the final round of the masters and the presentation of the coveted green jacket tomorrow right here on cbs. well, still ahead, the british government announces a major crackdown to save endangered elephants.

>> ninan: the british government this week announced plans for a major crackdown on the silicon valley ivory. it's an effort to stop the slaughter of tens of thousands of elephants each year. simon cullen has the story.

>> reporter: these giants of africa are the largest animals to roam the earth. but they're also under threat. each year, 20,000 elephants are slaughtered for their tusks. >> we will not tolerate the illegal trade in ivory, which is contributing to the destruction of an iconic species. >> reporter: the u.k. is vowing to ramp up efforts to put an end to poaching, introducing some of the toughest laws in the world. the british government will ban the sale of ivory items, regardless of their age, and impose even tighter exemptions on musical instruments and rare artifacts. antiques will need to be at least 100 years old to avoid the new ban. instruments must be made before 1975 and include less than 20% ivory. anyone caught breaching the rules will face up to five years in prison or an unlimited fine. animal rights groups are applauding the decision, saying it sends a strong message to the rest of the world. they point the finger at china, which is the largest market for

ivory, where each pound can fetch up to $1500. simon cullen, cbs news, london. >> ninan: when we return, it was one giant leap for science fiction. "2001: a space odyssey" turns 50.

the national air and space museum in washington, d.c. a new exhibit opens this weekend, celebrating the 50th anniversary of the groundbreaking sci-fi classic "2001: a space odyssey." christopher steele has called the movie the "big bang" of his film making generation. here's kris van cleave. >> liftoff. we have a liftoff. >> reporter: before the world watched live as neil armstrong took that one small step... >> it's one small step for man. >> reporter: ...director stanley kubrick and writer arthur c. clarke captured the nation's imagination with their groundbreaking film "2001: a space odyssey." while it earned mixed reviews, the film gained a cult

following, even if the ending left many baffled. when you walked in here the first time, what struck you? >> one of the things is the character of the lighting in the room. it is-- it reflects a-- an approach that kubrick took to usually build in the lighting into the sets themselves. >> reporter: martin colins is the curator of the smithsonian's air and space museum exhibit celebrating the film's 50ath anniversary. it includes this recreation of the iconic hotel room from the scene intended to make you think. >> are we alone in the universe? and if we encounter extraterrestrial life, how might that experience change us as well. >> a new book by michael benson, published by simon & schuster, a division of cbs, looks at the four-year production of the film. >> we're still talkin talking at "2001" 50 years later because for one thing, the film deals with four million years of human evolution. >> reporter: a year after "2001: a space odyssey" became at a bloc bust earthur c. clarke

appeared on cbs news, alongside walter cronkite, to cover the launch of apollo 11. >> i didn't imagine it would be in my lifetime. >> reporter: clark said he was already thinking about travel to mars and beyond. but chron criet kight wanted the answer to the question on everyone's mind, asking clarke to explain the end of the movie. >> would you like to tell me what that's all about? >> i don't think we have time. >> reporter: 50 yiers later, the debate about the ending is still going, and the movie still resonates with its artificial intelligence theme. the exhibit opens sunday. it is free, but if you want to avoid the line, you'll want a timed ticket. kris van cleave, cbs news, washington. >> ninan: and that's the cbs weekend news for this saturday. later on cbs, "48 hours." i'm reena ninan in new york. thank you for joining us. if good night. captioning sponsored by cbs captioned by media access group at wgbh access.wgbh.org

ll.. where a parking lot shou live from the cbs bay area studios. this is kpix five. a bay area recreation spot shutdown tonight after a storm left a waterfall, where a parking lot should be. plus, people in one bay area city are fed up with that. tonight, they are making some noise about it. first, a stabbing shuts down a busy bart station just as thousands of warriors fans were making their way to oriel arena.>> police say that a suspect is in custody tonight, after a stabbing at the coliseum station that left three people hurt. it happened about 3:00 this afternoon. one of the victims was taken to the hospital. we don't know their condition. the incident shutdown traffic to the station for two hours, just as warriors fans are

headed to oracle for tonight's 530 tipoff. >> we had to go all the way around and through. >> and all the confusion, too. >> everyone was like, where do we go? which way do we go? >> it was a little -- gary fisher. >> the police have not released the suspect's name or any information on a motor. service resumed about an hour ago. developing news out of mendocino county. authorities have recovered the body that may be one of the three children and went missing along a crash on the coastline. suv plunged off the cliff on highway 101 last week. sheriff's deputies say they found what appears to be a girl's body or near the town of westport. they have not released her name or age. the bodies of the children's adopted parents and three other siblings have already been recovered. but, two kids are still missing. authorities have said evidence from the suv indicates the trash was delivered. we have just le