next. news updates always on kpix.com. >> morgan: london terror arrest. an 18-year-old man is taken into custody following the bombing of a commuter train that injured nearly 30 people. isis has claimed responsibility. also tonight, dueling demonstrations in washington, d.c. where trump supporters staged what was billed as "the mother of all rallies." >> is it good for america? >> morgan: and richmond demonstrators faced off in the streets over confederate monuments. and one week after hurricane irma slammed the florida keys, storm-weary islanders are finally getting to see what's left of their homes. >> actually, we'll rebuild. i'm not leaving. this is the "cbs weekend news."

>> morgan: good evening. i'm demarco morgan with a western edition of the broadcast. an 18-year-old man was arrested today in connection with the terror bombing of a london subway train. the suspect was taken into custody about 70 miles southeast of london near the port of dover. the friday morning attack injured nearly 30 people and isis has claimed responsibility. charlie d'agata is in london. >> reporter: heavily armed security personnel swept into sunbury-on-thames, zeroing in on a home in connection with the subway bombing, a property registered to foster parents who had been honored for their work with children. masked police ordered hundreds of residents to evacuate for their own safety. >> you can just see someone's eyes, and they've got a gun sort of pointed down like that, and i can see the gun, his eyes, black-- i just thought oh, my god. what the hell is going on? >> reporter: the raid came just hours after the arrest of the teenager who investigators believe planted the bomb on the

subway train friday morning. police accomplice say he was picked up in the port town of dover, where ferries cross over to european countries like france. >> at approximately 7:50 a.m. this morning, local police officers in kent arrested an 18-year-old man in the departure area of the port of dover. he was arrested on suspicion of being concern in the commission, preparation or instigation in the acts of terrorism. >> reporter: as britain raised their security alerts to the highest local official, heavily armed officer were seen patrolling train stations and guarding important government buildings. the luckiest escape for most commuters is only now sinking in after the home made bomb in a bucket failed to detonate as planned. if it had, the ensuing explosion would have been catastrophic, which is why investigators and security forces alike moved so quickly today. this was no time to take any more chances.

tonight, here at the scene of the raid, investigators and forensic teams have been gathering evidence. scotland yard says at this stage they're keeping an open mind as to whether more than one person was involved in the attack. demarco. >> morgan: charlie d'agata reporting. charley, thank you. it was a day of dueling demonstrations in washington, w, d.c. supporters of president trump staged what was billed as "the mother of all rallies." other groups were out in full forces as well, including one wearing cloud makeup. here's jeff pegues. >> reporter: police are prepared for violence. hundreds of officers are posted on pennsylvania avenue in front of the trump hotel, as well as along the national mall, where several different groups of demonstrators are gathered. >> juggalos taking over d.c. >> reporter: among them, members of the juggalos. they are fans of the rap rock group insane clown posse. ♪ my heartbeat pounding >> reporter: this 2011

national gang threat assessment labeled the juggalos a loosely organized hybrid gang. >> we're not a gang! >> reporter: members of the group have been fighting that designation ever since and the perception that there could be violence here today. >> our group is not a violent group. >> reporter: brian mesaric is here from las vegas. >> i don't see our group as initiating violence or threats. we're not here for that. >> reporter: the concern is there could be clashes between the different groups of demonstrators. ♪ i love this land >> reporter: at the other end of the mall, close to the capitol, is what was billed as the mother of all rallies. >> coming to show support for donald trump, show support for our country. >> reporter: organizers say this is a pro-trump event and not an alt-right or white supremacist rally. >> i ain't worried about violence until it happens, and then it will be dealt with accordingly. >> reporter: last month in charlottesville, virginia, a white supremacist rally turned deadly. a man drove a car into counter-protesters. in the weeks since, u.s. officials have been bracing for the potential of more violence

at large demonstrations across the country. peggy wiseman, who is from fort myers, florida, says she came here to celebrate unity and diversity. >> i'm here to support the cause. >> reporter: what is the cause? >> the american way of life. >> reporter: originally, the organizers of the mother of all rallies expected about 20,000 people out here for this event. but in recent weeks, they revised those numbers down to about 5,000. today, it looks a lot smaller than that. jeff pegues, cbs news, washington. >> morgan: demonstrators took the debate over confederate monuments to the streets of richmond, virginia today. paula reid is there. >> if the monuments come down-- >> you're erasing history. >> reporter: members of a group called csa ii, the new confederate states of america, showed up today in richmond to really in support of the city statue of robert e. lee. organizers billed the event as a heritage rally and say the

statues serve as a necessary reminder of the past. >> we don't want history to repeat itself. we came too far to be knocked back down into this. >> reporter: the group was greatly outnumbered by counter-protesters, including those from the black lives matter movement. >> it's history. but it's awful history to me. >> reporter: one young woman was arrested and charged with disorderly conduct. but the majority of protesters exercised their first amendment right peacefully and even held civil discussions. >> what do you hope to accomplish today? >> this, having conversations like this. >> reporter: activist jacquline laqman says she showed up today to stand up for people who have been marginalized. >> whenever someone continues to perpetuate this false history of the honorable confederacy, and that these people should be honored, and they're just a part of the fabric of american history, that we come out and we correct the narrative. >> reporter: the city of richmond doesn't have any formal plans to remove the statue of general lee, but some have suggested that the city should

re-evaluate its civil war monuments on its famous monument ave. that mere suggestion was enough to prompt today's protest. demarco. >> morgan: north korea said today it aims to build a military force equal to that of the united states. the north also released photos of its friday morning missile launch with leader kim jong-un watching on as it sailed over japan and into the pacific. president trump says u.s. options to deal with the threat are "effective and overwhelming." mr. trump will address the u.n. general assembly on tuesday. hurricane jose continues to threaten the east coast. it's a category 1 storm with steady winds of 80 miles an hour. tonight, jose is more than 400 miles southeast of cape hatteras, north carolina. it's expected to bring rough seas and high winds from the carolinas to new england early in the week. one week after hurricane irma slammed florida residents of the hard-hit southern keys are returning to their homes this weekend to see the devastation.

today, jonathan vigliotti and his crew took the journey that many will embark on tomorrow. >> reporter: the deeper south you drive into the florida keys, the worse this destruction gets. here, you'll find a slice of state that's worlds away from naples and miami, which held up much better. officials on the ground say it could take at least one week before the keys is reconnected with that world. power, water, and cell service are still spotty. we hear at times it was a little bit like "lord of the flies," people really on their own. >> you just described it, and if you can imagine that and the kind of heat that we have had, mildew, damp, no water, no trft, get by on your own, or that's it. >> reporter: there have been clear signs of progress. yesterday, mariners hospital became the first medical facility in the keys to open, and 17% of people in the key west area and 65% of people in the rest of the keys have power. some people will have absolutely

nothing to return to. 25% of buildings here were completely destroyed. this fishing lodge leveled. many other buildings also heavily damaged. officials say it could take several years to fully rebuild. for now, the keys feel like no mans land. fema has set up temperature shelters for residents who come home to nothing, as well as workers who will help them rebuild. about 10% of residents here in the lower keys chose to ride out this storm in their homes. and tonight, there are crews out on these streets searching for those still missing. demarco. >> morgan: jonathan vigliotti. jonathan, thank you. on this last weekend of summer, parts of the u.s. are already dealing with snow. a few inches fell in the mountins of montana and wyoming friday. official says the snow is slowing the spread of wildfires but it won't bring an end to the fire season. coming up next, protests turn violent after a white former

police officer is acquitted in the fatal shooting of a black suspect.

>> morgan: peaceful demonstration turned violent in st. louis last night after a white former police officer was acquitted in the deadly shooting of a black man six years ago. dean reynolds is there. >> black lives matter! >> reporter: demonstrators launched a second day of protests here, unsure whether they would descend into the running street battles that punctuated last night's march. with mayor lyda krewson at his side, st. louis police chief lawrence o'toole last night praised his officers, several of whom were injured. >> our officers have been very tolerant and have used great restraint. >> black lives matter! >> reporter: when peaceful turned into confrontational and when protesting turned into

vandalizing, including defacing the mayor's private residence, the police took an assertive approach to crowd control. 32 arrests followed. it's all because former cop jason stockley was found not guilty yesterday in the 2011 shooting death of anthony smith, a man stockley believed was an armed drug dealer fleeing the police. prosecutors said stockley had planted a gun in smith's car after shooting him five times, to make it look as though his death was justified. but a judge ruled there was no proof of that and acquitted stockley, who later spoke to the ""st. louis post-dispatch." >> i did not murder anthony lamar smith. >> reporter: stockley left the police department four years dispoog now lift in houston, but the high-speed chase and the subsequent shooting here remains fresh in his mind. >> it feels like a burden is lifted, but the burden of having

to kill someone never really lifts. >> reporter: the city remains on edge, and several scheduled events have been canceled as a security precaution, including a concert by the band u2 at this 70,000-seat arena. demarco. >> morgan: dean reynolds reporting. dean, thank you. up next, a dreamer's story. she is one of about 800,000 living in immigration limbo.

>> morgan: polls show a majority of americans want to protect dreamers, young immigrants who were brought illegally into the u.s. they have been allowed to stay under the daca program, but until there's a deal in washington, some 800,000 dreamers remain in limbo. tonight, we have one dreamer's story. >> my name is marcela zhou. i'm currently a third-year

medical student at the david geffen school of medicine of u.c.l.a. i'm ethnically chinese. there's a really big chinese population in mexicali. i had a goal and a dream, and i think the u.s. had that offered to me. being undocumented and living in a border town where essentially most of my neighbores were working for some sort of law enforcement, especially with the border patrol, customs, there's a belief that undocument immigrants are all latinos, are all mexicans. and i think because of that, i was able to get by. simply because of the way i look. even though i am mexican, by nationality. >> effective immediately, the department of homeland security is take steps to lift the shadow of deportation from these young people. >> daca was life changing for me. i was able to just find a new sense of freedom that allowed me to travel and just feel safer. i have really embraced a lot of things in the united states, its

culture, its diversity. >> i'm here today to announce the program known as daca, that was effectuated under the obama administration, is being rescinded. >> it's such a distant memory at this point. i have not lived in mexico for a very long time. it's challenging having that in your mind, constantly, if i'll be deported. there's definitely that fear that comes back. it's almost like a reminder of people trying to tell you, "you don't belong here." but we have to fight against that and say, "i do belong here, and i have a lot to contribute." >> the effect of this unilateral executive amnesty denied jobs to hundreds of thousands of americans by allowing those same illegal aliens to take those jobs. >> we all want to contribute to this society. we all want to make a better life for ourselves. and i don't think we're stealing jobs when those jobs are out there, you know. i identify as a mexican, i identify as a latina, i identify

as a chinese person. i identify as an american. i'm trying to learn as much as i can with the time i have right now because i never know when this is going to end. and this opportunity didn't come easy, and so i'm not going to let go of it easily, either. >> morgan: unless the program is extended, daca recipients could start facing deportation in six months. still ahead, a new study maps the most dangerous roads in the country near schools. .

>> morgan: a new study pinpoints the nation's five worst counties for distracted drivers. they are in the major metropolitan areas of new york, san francisco, and miami. researchers found 88% of drivers are using their phones behind the wheel, in many cases in a school zone. christmas eve has more on this.

>> reporter: parents walking their kids to this san francisco elementary school might not know they're in the nation's second-most-dangerous county for distracted drivers. >> i'm about to step and walk across the street, and i almost got run over by somebody. >> reporter: bessie carmichael says she and her daughter have had several close calls. eight-year-old thalia thinks she knows why. >> they're on their phones. they're texting. >> reporter: a new study recently analyzed almost four million drivers cruising near 75,000 schools. it determined san francisco's bessie carmichael elementary has some of the most dangerous streets in the country for distracted driving. a school in houston has the worst drivers with campuses in manhattan and dallas rounding out the top five. in general, the more urban the county, the riskier the school roads. which is more drurks the morning drop-off or afternoon pickup? >> absolutely the afternoon by about 40%.

>> reporter: jonathan matus is c.e.o. of zendrive, the company behind the research. he says the afternoon hours from 2:00 to 5:00 p.m. are more dangerous than the morning, especially from 4:00 to 5:00 p.m., likely due to heavier work traffic. all his data is now collected online for anyone to access. >> we put all of this information into a very powerful map where you can search any name of anyone of the 75,000 schools that we collected. >> reporter: for instance if you type in the study's top rated school, victory christian school in north carolina, it will show you its a.-plus grade for average phone use. that's in contrast to trinity liewghtian church in infection taex. the area around that school received an "f." armed with new data, police can deploy more resources in dangerous areas. >> police work is driven by information, so if it is information is showing, we have to keep addressing traffic issues in order to make the

streets better, well, that's a good thing. >> reporter: matusz says he hopes parents will take any failing grades to their local school board and law enforcement. >> it's their duty to keep our kids safe, and now we can give them a scorecard and keep them accountable and help them focus the resources on the areas that really need that attention. >> reporter: carter evans, cbs news, san francisco. >> morgan: when we return, the "cassini" spacecraft ends its 20-year mission to saturn in a blaze of glory.

>> morgan: we end tonight, three planets further from the sun on saturn. nasa ended its "cassini" mission yesterday, sending the little space propose proeb that cowed. >> reporter: after 13 years in orbit around the ring giant, the "cassini" spacecraft plunged into saturn and vaporized. it was an emotional time for nasa scientists behind the mission. >> seeing a spacecraft that i've

come to think of as a member of the family disappear, touched my soul. >> reporter: it also touched planetary society member robert picardo, who gave "cassini" a very special send-off. you may remember him as the holographic doctor on "star trek: voyager." >> calculate the variables. >> reporter: but the project may have meant the most to "cassini" scientist linda spilker. since the 1980s, she worked to get the satellite off the ground while raising her daughters. they brought along granddaughter audrey to make the final farewell a family affair. what was it like to have your daughters here with you? >> oh, it was so wonderful to share this moment. >> we're so proud of her. >> so proud. >> we're so proud of you, mom. and she's an amazing role model. she's been a great role model for us. we're both engineers so math and science run in the family. >> reporter: there were many scientific success, including the discovery of an underground ocean and great plumes of ice

particles gushing from the moon. water means the possibility of some form of life, so nasa didn't want to risk contaminating the moon with particles from earth. now that "cassini" has burned out, this is the only way you'll be able to see it-- as a model. but the scientists who worked on the project say they don't see this as an end but a new beginning. >> in reality, we're just at a different phase. >> reporter: james green is the director of planetary science for nasa. the last 24 hours of the satellite's life, meant a massive, last-minute data collection. >> we're also going to be finding new discoveries that are going to come out in papers next year, two years, 10 years from now. >> reporter: a grand finale where the information gathered might just live to infinity and beyond. jamie yuccas, cbs news, pasadena. >> morgan: that's the cbs weekend news for this saturday. later on cbs, "48 hours." i'm demarco morgan in new york. thanks for watching.

months since this dramatic crash in a bay area crosswalk. and as new at six. it has been two months since the dramatic crash in a bay area crosswalk and as the young victim slowly recovers from life changing injuries, the city is putting safety in programs on the fast track. we are live at the open intersection with a push to make it safer for pedestrian. da. >> reporter: public works just repaved fruitville avenue and the city will put in flashing lights. the idea is to alert drivers to stop when pedestrians cross the street. too late for this one family

but the goal is to prevent future accidents. >> the bright lights and impact and the psychological pay. the recurrent nightmares for mendoza. two-and-a-half months after this accident, carla relies on a walker. she will have her knee surgery in two months. for her five-year-old brother jonathan, doctors say he may never be able to walk again. >> the doctor will take care of me. >> are you feeling better? >> yes. >> police say a licensed driver hit jonathan and r nathan was pinned under the front tire. he is able to move his toes