This is the cbs weekend news. Ninan good evening. Im reena ninan. We beginning gin with breaking news from london. British police are responding to an incident at the iconic London Bridge. A witness tells the bbc a van veered off the road and hit several people. Its not clear if this was an accident or an attack. The bbc is reporting a man was taken from the scene in handcuffs. The u. S. Embassy in london is urging people to avoid the area and monitor local news. London bridge is closed in both directions. The London Bridge train station also closed, and were following the situation right now on our 24hour streaming channel cbsn at cbsnews. Com. Demonstrators were on the march from coast to coast today at rallies in washington, d. C. And fountain valley,ville. Crowds applauded President Trumps decision this week to pull out of the paris climate accord. Antitrump protesters took to the streets in new york and denver raising their voices for tougher investigations into team trumps relations with russia. This all comes days before fired f. B. I. Director james comey is scheduled to testify on capitol hill. Paula reid is at the white house. Our first foreign trip was full of historic and unprecedented achievements. Reporter in his weekly address, President Trump said he looks forward to working with other World Leaders following his first trip overseas. Joined by many old and new friends, we have paved the way for the new era of cooperation. applause reporter but just days after returning to the u. S. , he angered many World Leaders by withdrawing from the paris climate agreement. The United States will withdraw from the paris climate accord. Reporter in europe, the president s decision was met with shock and dismay. What so proudly. Reporter the president did receive some support at home. On saturday, a group of supporters rallied outside the white house to express thanks for making good on a campaign promise. Fitzburg, not paris reporter the president has another potentially controversial decision to make this week whether to block james comey from testifying before the senate on thursday. I dont think there is a legitimate claim of executive privilege here. Reporter congressman adam schiff says he wants to hear comey testify about any attempt to interfere with the russia investigation. I think the whole country needs to know was the president putting pressure on the director of the f. B. I. To drop any part of the russia investigation . Reporter but senator Lindsey Graham says he worries the comey hearing could turn into a hit job on the president. Heres what i worry about, that hell just focus on his conversation with the president and not answer any other questions because of the investigation. That would be a hit job on President Trump. Reporter the president has the right to invoke his executive privilege to keep certain conversations private. But legal experts say he may have undermind his case by tweeting about those conversations. Reena, our source tell us that the former f. B. I. Director has received no indication that the president intends to block his testimony. Ninan thanks, paula. Tomorrow on face the nation john dickersons guests will include senators mark warner and susan collins, both members of the Senate Intelligence committee, and House Minority leader nancy pelosi. A large crowd marched across the Golden Gate Bridge saturday to protest gun violence. Demonstrator woars orange in honor of National Gun Violence awareness day. America has among the highest rates of gun violence in the world. In manchester, england, security is ramped up for tomorrow nights allstar concert benefiting the victims of last months terror bombing. The attack, at an Ariana Grande concert, left 22 people dead and more than 100 wounded. Grande, justin beiber, coldplay, and katy perry are all performing tomorrow at manchesters old trafford cricket ground. Roxana saberi tells us security is heightened. Reporter as crews set the stage for sundays concert in manchester benefiting victims of last months terror attack, social media is lighting up with photos of Ariana Grande paying a surprise visit to victims of the blast. We just really, really good with them, really brilliant. Reporter eightyearold Lily Harrison is recovering from a spinal wound. Her father says the pop star made his daughter feel like a rock star. As a parent it just really, really made it for us. You do get goosebumps thinking about it. Reporter the deadly suicide bombing at grandes may 22 performance is intensifying security concerns at concerts across the world. In germany, a Terror Threat shut down a Music Festival on friday, sending thousands of fans home. The event resumed on saturday after a thorough sweep of the venue. All metal objects are out of your pockets, please. Reporter concertgoers are also seeing stepped up security here in the u. S. Officials in chicago say theyre sending extra officers to Soldier Field where u2 is performinperforming this weeken. Prepare to be checked twice before you get into the stadium. Reporter theyre also keeping watch from this 24hour command center. And in new york, hundreds of uniformed officers and private security personnel are monitoring the governors ball, a threeday Music Festival. Organizers say the Manchester Attack factored into their planning. What that caused us to do is really rereview everything and have more conversations about it all. Reporter billy khallive says after the Manchester Bombing she wouldnt let her 17yearold dawrkt emily, come here alone. I just feel with whats going on in this world, its important to have a responsible parent to be with young adults. At first i was like, oh, you know, its kind of weird having my mom here. But a lot of my friends parents felt better knowing someones mom is going to be here. Reporter people here have been told not to bring big backpacks, or exwraels. Glass containers or picnic baskets. Music fans across the u. S. Will be hearing similar advice as the summer concert season kicks off. Reena. Ninan this past week, the new secretary of Veterans Affairs said his department will try to cut number of Homeless Veterans in the u. S. From 40,000 to somewhere below 15,000 during the trump administration. Tonight, carter evans tells us about a project thats helping the v. A. Reach their voal goal. I served my country. You just do what youre told. Thats all you can do. Reporter dale dollar was just 22 when he left the marines, but as a civilian Business Ventures stalled. He found himself out of work and eventually out on the street, homeless for 14 years, until he moved in to potters lane. This place, they dont talk about it. They walk the walk and talk the talk. Reporter the entire apartment complex was built for Homeless Veterans, but thats not what makes it unique. Its the first multifamily building constructed entirely of recycled shipping containers. Most of the 1200 monthly rent is subsidized, according to stever fourier. In orange county, on any given night, there are between 400 and 450 Homeless Veterans which for us is a national crime. There should be no Homeless Veterans. Reporter it took about six months to convert 48 shipping containers that had previously been used to transport dry goods into 16 studio apartments that are each about 500 square meet feat. And while the steelwalled containers are Strong Enough to be stacked 10 stories high, organizers kept it small for a reason. When youre dealing with people who have been homeless and you warehouse them in 300 unitses, youre not creating a safety net for people. Youre not creating a Human Connection with people. The concept here is called housing first. Find a home for them, like we found here. Then you surround them with social services. Reporter kurt carson also serve in the marines, and like dale, he lived along the Santa Ana River bed for six years. If you cant get mail or you cant go somewhere to clean up and you dont have any place where you can, you know, have a phone number, then how do you think somebody is going to reintegrate into society . Its not going to happen. Reporter after more than a decade without a roof over his head, dale dollar is finally able to cook a warm meal in his own kitchen. Its quite a place. You know, you come in, youve been sleeping in a tent and on dirt and rocks for years, and having to fight to keep your stuff. And you end up in a place as beautiful as this, ive been blessed more than i should have been. Its wonderful. Reporter for him, its not just a new apartment. Its a new lease on life. Carter evans, cbs news, midway city, california. Ninan there are staggering new statistics on homelessness in los angeles county. The latest count released wednesday shows there are nearly 58,000 Homeless People in l. A. County, up 23 from last year. Experts say the high cost of living is a major factor. A growing number of people on the streets are children and young adults. Mireya villarreal has more on this. Reporter what did you expect when you got here . Palm trees and sunny days. Reporter anyearold yums garner says he came to los angeles to escape the drug drugd gangs in his home town. But once here, he wound up on the streets. I try to sleep on rooftops. Thats the safest place. Reporter how hard has it been for you, though, to find a job . Pretty hard to find a job, finding a place to live, thats even harder. Reporter garner is among a groarg population of young people between 13 and 24 who are homeless and alone without the guidanceave parent or guardian. Many of them ran away from abusive families. Its pretty rough out here. Reporter drake hudson said he left home after getting into several awrmtses with his parents. Whats your day like . Mainly just focused on getting food and thats pretty much it. Is just food. Reporter some studies estimate there are between 1. 6 and 2. 8 million unaccompanied Homeless Youth across the country, but no one knows for sure. So this year, the department of housing anhousing and urban devs focused on getting a more accurate count. How long have you been homeless this time . Ive been homeless about two months. Reporter volunteer counters, some homeless themselves, recently canvassed l. A. And other cities in search of Homeless Youth, but finding them can be difficult says ucs associate professor eric rice. Oftentimes what homeless use will do is they will be sleeping on a friends couch for a couple of nights and theyll be sleep under an underpass overnight and they dont want to be associated with homelessness. They dont want it to be their identity. So they do everything they can to appear to be just a normal 20 years because they are a normal 20yearold. Reporter advocates say the counts results will mean more federal funding for programs aimed at helping these nung jung people. Huds goal is to End Youth Homelessness by 2020. Garner hopes its a lot sooner. There need to be more people caring, people realizing the situation were in and were not bad people. Reporter mireya villarreal, cbs news, los angeles. Ninan rock legend gregg allman was laid to rest today in macon, georgia. Among the mourners, jimmy carter and allmans exwife, cher. He was one of the Founding Fathers of southern rock. He died last week of liver cancer at the age of 69. 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Reporter Succhi Ramesh was born in india and came to the United States a decade ago to work in technology. Im very much a nerd. Reporter but a couple of years ago, she quit to found succhi incorporated, hoping to revive an industry many left for dead. People think immigrants are taking american jobs. Uhhuh. Reporter how do you feel about that . I honestly feel like you cant separate the immigrant from the american. When you think of america, you think of people that have chased their dreams and have been successful. And in many ways, that is an immigrant. Reporter succhi now employs 60 people, producing clothes for other businesses, including uniforms and small batches for young and notsoyoung designers like frank bruno. Im a startup company. Reporter after decades in blue collar jobs, bruno decided to launch a line of blue collar shirts. You see, its unique. Its a different color. Reporter and when it came to making them it had to be american. Does it surprise you that your americanmade clothes are in a factory founded by an indianborn businessperson . Yes. And it pleases me. Because this is what its all about. This is the american way. Reporter while it costs about 20 more to make clothes in america, succhi says the tradeoff is unmatched speed, quality, and flexibility. China and indian and bangladesh are not set up to meet where retail is heading, and when your supply chain is halfway around the world it just, by default, cannot serve these needs. Creativity happens when you are combining two new things. Reporter nyu economist petra moser says immigrant entrepreneurs have a long history in the u. S. Go back as fa as far as drew,o came from scotland, and built a very, very large, industrial you might even call it an industrial empire and created many, many jobs. Reporter succhi now plans to add 40 more jobs by the end of the year, a reminder that immigrants dont always take work from americans. They create work, too. If you have hardworking people and you have people when they come together, you know, magic can happen. Reporter tony dokoupil, cbs news, bergen, new jersey. Ninan still ahead, was a teenaged girl lured to her death with a few key strokes on a with a few key strokes on a Smartphone App . 48 hours investigates. Who hugs a friend. Who is done with treatments that dont give you clearer skin. Be the you who controls your psoriasis with stelara® just 4 doses a year after 2 starter doses. Stelara® may lower your ability to fight infections and may increase your risk of infections and cancer. Some serious infections require hospitalization. Before treatment, get tested for tuberculosis. Before starting stelara® tell your doctor if you think you have an infection or have symptoms such as fever, sweats, chills, muscle aches or cough. 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